Add Backstage metadata (#534)

* Add Backstage metadata

Co-authored-by: Joshua J. Bouw <joshua@aurora.dev>
Co-authored-by: Kirill <kirill@aurora.dev>

.catalog-info.yaml

@@ -0,0 +1,11 @@
+---
+apiVersion: backstage.io/v1alpha1
+kind: Location
+metadata:
+  name: aurora-engine-public
+  description: Public Aurora Engine repository
+spec:
+  targets:
+    - ./engine/.catalog-info.yaml
+    - ./etc/eth-contracts/.catalog-info.yaml
+    - ./engine-precompiles/.catalog-info.yaml

engine-precompiles/.catalog-info.yaml

@@ -0,0 +1,41 @@
+---
+apiVersion: backstage.io/v1alpha1
+kind: Component
+metadata:
+  name: aurora-engine-precompiles
+  description: |-
+    EVM precompiles for the Aurora engine
+  tags:
+    - precompiles
+    - contract
+    - near
+  links: []
+  annotations:
+    aurora.dev/security-tier: "1"
+spec:
+  owner: engine-team
+  type: contract
+  lifecycle: production
+  system: aurora-engine
+  interactsWith: []
+---
+apiVersion: backstage.io/v1alpha1
+kind: Component
+metadata:
+  name: aurora-engine-precompiles-native
+  description: |-
+    Aurora and NEAR specific precompile additions
+  tags:
+    - precompiles
+    - contract
+    - near
+  links: []
+  annotations:
+    aurora.dev/security-tier: "1"
+    backstage.io/source-location: url:https://github.com/aurora-is-near/aurora-engine/blob/master/engine-precompiles/src/native.rs
+spec:
+  owner: bridge-team
+  type: contract
+  lifecycle: production
+  system: aurora-engine
+  interactsWith: []

engine/.catalog-info.yaml

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+---
+apiVersion: backstage.io/v1alpha1
+kind: Component
+metadata:
+  name: aurora-engine
+  title: Aurora (engine)
+  description: |-
+    The Aurora engine
+  tags:
+    - contract
+    - near
+  links: []
+  annotations:
+    aurora.dev/security-tier: "1"
+spec:
+  owner: engine-team
+  type: contract
+  lifecycle: production
+  system: aurora-engine
+  deployedAt:
+    - contract:near/mainnet/aurora
+  interactsWith: []

etc/eth-contracts/.catalog-info.yaml

@@ -0,0 +1,21 @@
+---
+apiVersion: backstage.io/v1alpha1
+kind: Component
+metadata:
+  name: aurora-engine-token
+  description: |-
+    Aurora ERC-20 contract for bridged tokens
+  tags:
+    - contract
+    - aurora
+  links: []
+  annotations:
+    aurora.dev/security-tier: "1"
+spec:
+  owner: engine-team
+  type: contract
+  lifecycle: production
+  system: aurora-engine
+  deployedAt:
+    - contract:aurora/mainnet/0x8bec47865ade3b172a928df8f990bc7f2a3b9f79
+  interactsWith: []