AIP-84 Migrate Config related public endpoint to FastAPI 

### Description

Migrate the following endpoint:

- [x] Get Current configuration
- [x] Get a option from configuration


### Use case/motivation

[AIP-84](https://cwiki.apache.org/confluence/display/AIRFLOW/AIP-84+UI+REST+API)

### Related issues

Relates to: https://github.com/apache/airflow/issues/42370

### Are you willing to submit a PR?

- [ ] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)


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AIP-84 Migrate Config related public endpoint to FastAPI #42745

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AIP-84 Migrate Config related public endpoint to FastAPI #42745

Description

Description

Use case/motivation

Related issues

Are you willing to submit a PR?

Code of Conduct

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

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