docs: delete assets api

[luthfifahlevi]

### Create Reference API for Delete Assets

Idea: DeleteAssets as DELETE /v1/assets/: an async API that will return how many rows that will affect based on filter criteria, and delete those rows from PostgreSQL (assets and lineage) and Elasticsearch in asynchronous.

Request:

• query_expr represent query expr for filter criteria: https://github.com/expr-lang/expr.
• dry_run represent whether it only return how much affected rows (if set to true), or also perform deletion process in the background (default: false).

Response: affected_rows represent how many rows that will affect based on filter criteria.

Current Approach:

• Query Expr --> AST --> SQL query and ES query.
• Use those query as WHERE clause in SQL and filter in ES query in deletion process, make this process in asynchronous.
• Return the affected rows

[coveralls]

Pull Request Test Coverage Report for Build 10503587786

Details

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• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 85.134%

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Change from base Build 10093937236:	0.0%
Covered Lines:	6345
Relevant Lines:	7453

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