[File system] Enable clients access the Google File System through the FileSystem security token receiver API

### Search before asking

- [x] I searched in the [issues](https://github.com/alibaba/fluss/issues) and found nothing similar.

### Motivation

Enable clients access the Google File System through the FileSystem security token receiver API
https://github.com/alibaba/fluss/pull/631#discussion_r2046140327

### Solution

Implement method obtainSecurityToken on `GSFileSystem`
Implement `GSTokenProvider` and `GSTokenReceiver` as a `SecurityTokenReceiver` implementation.
Adapt the `com.alibaba.fluss.fs.token.Credentials` google cloud `com.google.api.client.auth.oauth2.Credential`

### Anything else?

_No response_

### Willingness to contribute

- [x] I'm willing to submit a PR!