Add GitHub web forms-based issue templates (#1189)

* Add issue template for bug reports
* Add issue template for feature requests
* Still allow the old issue template for now
* Provide links to other Caliper forums

Signed-off-by: Attila Klenik <a.klenik@gmail.com>

.github/ISSUE_TEMPLATE/bug-report.yml

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+name: Bug Report
+description: File a bug report
+body:
+  - type: markdown
+    attributes:
+        value: Thank you for helping us make Caliper better by submitting a bug report!
+  - type: markdown
+    attributes:
+        value: "## Environment information"
+  - type: input
+    id: caliper_version
+    attributes:
+      label: Which Caliper version are you using?
+      placeholder: "For example: v0.4.2, or latest"
+    validations:
+      required: true
+  - type: input
+    id: nodejs_version
+    attributes:
+      label: Which Node.JS version are you using?
+      placeholder: "For example: v10"
+    validations:
+      required: true
+  - type: input
+    id: os
+    attributes:
+      label: Which operating system are you using?
+      placeholder: "For example: Ubuntu 20.04 LTS"
+    validations:
+      required: true
+  - type: markdown
+    attributes:
+        value: "## Behavior information"
+  - type: textarea
+    id: context
+    attributes:
+      label: Please provide some context for your error. For example, when did the error occur? What were you trying to achieve, and how?
+      placeholder: "For example: I tried to monitor remote Docker containers..."
+    validations:
+      required: true
+  - type: textarea
+    id: actual_behavior
+    attributes:
+      label: What was the observed incorrect behavior?
+      placeholder: "For example: Caliper hangs and waits for submitted transactions indefinitely."
+    validations:
+      required: true
+  - type: textarea
+    id: error_log
+    attributes:
+      label: Please provide the error logs and their surroundings.
+      placeholder: "Error logs"
+      render: text
+    validations:
+      required: true
+  - type: textarea
+    id: bench_config
+    attributes:
+      label: Please provide your benchmark configuration file content, if possible.
+      placeholder: "test: ..."
+      render: yaml
+    validations:
+      required: false
+  - type: textarea
+    id: network_config
+    attributes:
+      label: Please provide your network configuration file content, if possible.
+      placeholder: "name: Fabric ..."
+      render: yaml
+    validations:
+      required: false
+  - type: textarea
+    id: workload
+    attributes:
+      label: Please provide your workload module content, if possible.
+      placeholder: "JS file content"
+      render: nodejs
+    validations:
+      required: false
+  - type: markdown
+    attributes:
+        value: "## Additional information"
+  - type: textarea
+    id: additional
+    attributes:
+      label: Please provide any additional information you deem relevant to the error.
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Hyperledger Caliper Rocket.Chat channel
+    url: https://chat.hyperledger.org/channel/caliper
+    about: Please ask general questions about the project here (LFID required).
+  - name: Hyperledger Caliper mailing list
+    url: https://lists.hyperledger.org/g/caliper
+    about: Please ask general questions about the project here (LFID recommended).

.github/ISSUE_TEMPLATE/feature-request.yml

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+name: Feature Request
+description: Request a new Caliper feature
+labels: [enhancement]
+body:
+  - type: markdown
+    attributes:
+        value: Thank you for sharing your ideas about how to improve Caliper!
+  - type: textarea
+    id: limitation
+    attributes:
+      label: Please share the technical limitation of Caliper that you encountered.
+    validations:
+      required: true
+  - type: textarea
+    id: feature
+    attributes:
+      label: Please detail your feature idea that could alleviate the limitation.
+    validations:
+      required: true
+  - type: textarea
+    id: context
+    attributes:
+      label: Please share some details about your use case if possible, and how the new feature would make Caliper a better performance benchmarking framework.
+    validations:
+      required: false
+  - type: textarea
+    id: suggestions
+    attributes:
+      label: Please share any suggestions about the new feature's code/configuration API (using formatted YAML segments or pseudo-code).
+    validations:
+      required: false