Enhancement: Add swagger API documentation

[parmesant]

Description

Adds API documentation using utoipa from within Rust code. Also generates an up-to-date openapi yaml spec as soon as the server starts up.
To view the swagger page, go to {endpoint}/swagger-ui/

To build the docusaurus page follow these steps-

rm -rf build/ # Remove the old build directory (might be unnecessary)
yarn docusaurus clean-api-docs all #  remove pre-existing `mdx` files
yarn docusaurus gen-api-docs all # make new `mdx` files
yarn docusaurus build # build the server (or use whatever command you use to build production server)
npm run serve # Serve (or use production command)

Covered scopes-

• logstream
• query
• ingestion
• user
• rbac
• liveness (partial since can't add two variants of the same endpoint)
• readiness (partial since can't add two variants of the same endpoint)

Quirks

Request headers are specified as an attribute for params of a request and hence can't be optional (added a note in their description explaining their nature)

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This PR has:

• been tested to ensure log ingestion and log query works.
• added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader.
• added documentation for new or modified features or behaviors.

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[parmesant]

I have read the CLA Document and I hereby sign the CLA