[7.x] [Security] Adds field mapping support to rule creation (#70288) #70603
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## Summary Resolves: elastic#65941, elastic#66317, and `Add support for "building block" alerts` This PR is `Part I` and adds additional fields to the `rules schema` in supporting the ability to map and override fields when generating alerts. A few bookkeeping fields like `license` and `author` have been added as well. The new fields are as follows: ``` ts export interface TheseAreTheNewFields { author: string[]; building_block_type: string; // 'default' license: string; risk_score_mapping: Array< { field: string; operator: string; // 'equals' value: string; } >; rule_name_override: string; severity_mapping: Array< { field: string; operator: string; // 'equals' value: string; severity: string; // 'low' | 'medium' | 'high' | 'critical' } >; timestamp_override: string; } ``` These new fields are exposed as additional settings on the `About rule` section of the Rule Creation UI. ##### Default collapsed view, no severity or risk score override specified: <p align="center"> <img width="500" src="https://user-images.githubusercontent.com/2946766/86090417-49c0ee80-ba67-11ea-898f-a43af6d9383f.png" /> </p> ##### Severity & risk score override specified: <p align="center"> <img width="500" src="https://user-images.githubusercontent.com/2946766/86091165-a8d33300-ba68-11ea-86ac-89393a7ca3f5.png" /> </p> ##### Additional fields in Advanced settings: <p align="center"> <img width="500" src="https://user-images.githubusercontent.com/2946766/86091256-cbfde280-ba68-11ea-9b63-acf2524039bd.png" /> </p> Note: This PR adds the fields to the `Rules Schema`, the `signals index mapping`, and creates the UI for adding these fields during Rule Creation/Editing. The follow-up `Part II` will add the business logic for mapping fields during `rule execution`, and also add UI validation/additional tests. ### Checklist Delete any items that are not applicable to this PR. - [x] Any text added follows [EUI's writing guidelines](https://elastic.github.io/eui/#/guidelines/writing), uses sentence case text and includes [i18n support](https://github.com/elastic/kibana/blob/master/packages/kbn-i18n/README.md) - [ ] [Documentation](https://github.com/elastic/kibana/blob/master/CONTRIBUTING.md#writing-documentation) was added for features that require explanation or tutorials - Syncing w/ @benskelker - [x] [Unit or functional tests](https://github.com/elastic/kibana/blob/master/CONTRIBUTING.md#cross-browser-compatibility) were updated or added to match the most common scenarios - [x] This was checked for [keyboard-only and screenreader accessibility](https://developer.mozilla.org/en-US/docs/Learn/Tools_and_testing/Cross_browser_testing/Accessibility#Accessibility_testing_checklist) ### For maintainers - [x] This was checked for breaking API changes and was [labeled appropriately](https://github.com/elastic/kibana/blob/master/CONTRIBUTING.md#release-notes-process)
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Backports the following commits to 7.x: