[Doc]: Sequence as a Backend for REST APIs

[BLasan]

Purpose

Provide custom mediation logic for REST APIs which can act as a backend or provide configurations for connectors.

Approach

1. Provide a new Endpoint Type "Sequence Backend" for REST APIs under Endpoint Tab

2. Allow Sequences to be added for Sandbox and Production Key types separately,.

3. Perform download, delete, upload operations for Sequence Backends.

4. Add support for APICTL import and export scenarios for REST APIs. When importing the REST API, endpoint configuration defined in the api.json should be as follows.

{
  "endpoint_type": "sequence_backend",
   "sandbox": "sequence-sandbox.xml"
   "production": "sequence-production.xml"
}

6. Introduced a new table to store Sequence Backend to perform delete, put, get operations

User stories

• Provide custom mediation logic to integrate REST APIs with connectors and work as a backend for REST APIs.
• Support APICTL import/export operations for REST APIs with Sequence Backend endpoint type.

Related PRs

• [Feat]: Provide Sequence as a Backend for APIs apim-apps#743
• Add: Support Custom Sequence as a Backend of an API carbon-apimgt#12524

Issue

• Add Custom Backend for APIs api-manager#3007

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