AIP 84: Migrate GET one ASSET legacy API to fast API

[amoghrajesh]

NOTE TO REVIEWERS
Only last 2 commits are relevant

Depends on #43783
related: #42370

Migrating the connexion API for GET one ASSETS to fastAPI.

Testing performed:

Same setup as #43783

API responses:

Legacy:

FastAPI:

Swagger Spec:

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[amoghrajesh]

@pierrejeambrun a note for you

[amoghrajesh]

Since we can pass uri in the path parameters and fastAPI encodes and decodes it, for fastAPI to be able to recognise the uri's properly, following starlette's path convertor here.

The {uri:path} portion specifies that the uri part of the path is a variable that can contain any sequence of characters, including slashes (/), making it a path parameter.

{uri:path}
uri is the name of the path parameter.
:path tells fastAPi that this parameter should capture everything in the path.

References:

1. https://stackoverflow.com/questions/72801333/how-to-pass-url-as-a-path-parameter-to-a-fastapi-route
2. https://www.starlette.io/routing/#path-parameters

[kaxil]

This should now move to airflow/api_fastapi/core_api/datamodels/assets.py after we merged PR: #43823

[pierrejeambrun]

A few common comments from the previous PR that this work is based off.

Otherwise looks good, I'll do a final in depth review once the previous PR is merged.