Add devportal rest api changes for API Chat feature

[ashera96]

Purpose

Add devportal REST API changes needed for API Chat feature.

Approach

We have introduced two resources to handle the API Chat testing capabilities:

• apis/{apiId}/api-chat/prepare
• apis/{apiId}/api-chat/execute

The following configuration is added to the deployment.toml to handle feature enablement and configuring.

[apim.ai]
enable = true
token = "<on-prem key>"
endpoint="http://localhost:9090"

Related PRs

• Add default configuration for AI features product-apim#13422
• Add API Chat feature UI implementation apim-apps#614

[codecov]

Codecov Report

Attention: Patch coverage is 1.97802% with 446 lines in your changes are missing coverage. Please review.

Project coverage is 47.48%. Comparing base (e7e8b35) to head (5292151).
Report is 52 commits behind head on master.

❗ Current head 5292151 differs from pull request most recent head b9053a0. Consider uploading reports for the commit b9053a0 to get more accurate results

Files	Patch %	Lines
...imgt/rest/api/store/v1/dto/ApiChatResponseDTO.java	0.00%	67 Missing ⚠️
...mgt/rest/api/store/v1/impl/ApisApiServiceImpl.java	0.00%	66 Missing ⚠️
...pimgt/rest/api/store/v1/dto/ApiChatRequestDTO.java	0.00%	46 Missing ⚠️
...st/api/store/v1/dto/ApiChatRequestResponseDTO.java	0.00%	46 Missing ⚠️
...t/api/store/v1/dto/ApiChatResponseResourceDTO.java	0.00%	38 Missing ⚠️
...est/api/store/v1/dto/ApiChatRequestApiSpecDTO.java	0.00%	30 Missing ⚠️
...imgt/rest/api/store/v1/dto/EnrichedAPISpecDTO.java	0.00%	30 Missing ⚠️
...n/apimgt/rest/api/store/v1/dto/SampleQueryDTO.java	0.00%	30 Missing ⚠️
...ava/org/wso2/carbon/apimgt/impl/utils/APIUtil.java	18.75%	26 Missing ⚠️
...rbon/apimgt/rest/api/store/v1/dto/SettingsDTO.java	0.00%	18 Missing ⚠️
... and 8 more

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #12347      +/-   ##
============================================
+ Coverage     47.47%   47.48%   +0.01%     
- Complexity     4147     4188      +41     
============================================
  Files          1840     1851      +11     
  Lines        136468   136988     +520     
  Branches      19753    19812      +59     
============================================
+ Hits          64786    65054     +268     
- Misses        64037    64268     +231     
- Partials       7645     7666      +21     

Flag	Coverage Δ
integration_tests	42.28% <1.97%> (+0.06%)	⬆️
unit_tests	20.13% <0.00%> (-0.30%)	⬇️

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