[Feature][MongoCDC] can i not set schema， and sync all fields

### Search before asking

- [x] I had searched in the [feature](https://github.com/apache/seatunnel/issues?q=is%3Aissue+label%3A%22Feature%22) and found no similar feature requirement.

### Description

if it has many collections in my db, i must set all fields, it is much difficult.

so i want sync all fields and not config the fields of schema.

### Usage Scenario

https://seatunnel.apache.org/docs/2.3.12/connector-v2/source/MongoDB

i see mysql cdc docs, it can ran with out setting fields.

### Related issues

_No response_

### 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://www.apache.org/foundation/policies/conduct)

Start with the MongoDB CDC connector documentation at the linked MongoDB source page and compare its schema and field configuration with the MySQL CDC documentation. Done means MongoCDC can sync all fields across collections without requiring every schema field to be configured.

Written by the indexing model from the issue text.