DISC-458 | Autocomplete suggestion endpoint

[utsav-ladia-atlan]

Change description

Added the endpoint for search suggestion to handle the post request and get autocomplete suggestions.

Description here
Tested the /search/suggestions endpoint with post request and test query.
Received the expected matched result from the ES running locally through this endpoint.

Type of change

• Bug fix (fixes an issue)
• New feature (adds functionality)

Related issues

Fix [DISC-458]()

Checklists

Development

• Lint rules pass locally
• Application changes have been tested thoroughly
• Automated tests covering modified code pass

Security

• Security impact of change has been considered
• Code follows company security practices and guidelines

Code review

• Pull request has a descriptive title and context useful to a reviewer. Screenshots or screencasts are attached as necessary
• "Ready for review" label attached and reviewers assigned
• Changes have been reviewed by at least one other contributor
• Pull request linked to task tracker where applicable