Added API Endpoint for Validating Connection Parameters

[MinuraPunchihewa]

Description

This PR adds an API endpoint for the checking the validity of integration connection parameters.

Fixes https://linear.app/mindsdb/issue/BE-624/test-data-connection-details

Type of change

• ⚡ New feature (non-breaking change which adds functionality)

Verification Process

To ensure the changes are working as expected:

• Test Location: Specify the URL or path for testing.
• Verification Steps: Outline the steps or queries needed to validate the change. Include any data, configurations, or actions required to reproduce or see the new functionality.

Additional Media:

• I have attached a brief loom video or screenshots showcasing the new functionality or change.

Checklist:

• My code follows the style guidelines(PEP 8) of MindsDB.
• I have appropriately commented on my code, especially in complex areas.
• Necessary documentation updates are either made or tracked in issues.
• Relevant unit and integration tests are updated or added.

[ZoranPandovski]

Maybe we choose a different path name as health or status ? WDYT?

[MinuraPunchihewa]

Hmm.. Would connection/status be better? Just to avoid any confusion between the status of the connection and the handler itself?

[ZoranPandovski]

I was thinking of something to sound more like action instead of using a verb in path

[MinuraPunchihewa]

OK, shall I make it handler/status then?

[ZoranPandovski]

Yes, please also add docs