Add Prometheus Provider

### Description Prometheus supports a pushGateway option to push metrics to Prometheus. This might be useful in cases where metrics needs to be pushed in the ETL stage. For example, BigQuery has metrics stored in information_schema tables which can be queried using Standard SQL. Its useful to run the Query and store the metrics in prometheus on a periodic basis. https://github.com/m-lab/prometheus-bigquery-exporter Suggestion is to add a Prometheus provider first and have a separate PR for BigQueryToPrometheus transfer feature. ### Use case/motivation _No response_ ### Related issues _No response_ ### Are you willing to submit a PR? - [X] 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)