Session / Transaction read and write concern configuration

[rcollina]

Is your feature request related to a problem? Please describe.
Hello, thank you for open sourcing your Transactions extensions.
This is a feature request.

Describe the solution you'd like
At the moment, and as far as I can tell, there is now way to configure ClientSessionOptions or TransactionOptions.

mongo-extensions/src/Transactions/TransactionStore.cs

Line 41 in d749275

session.StartTransaction();

Use case: https://www.mongodb.com/docs/v6.0/core/transactions/#read-concern-write-concern-read-preference

Describe alternatives you've considered
None.

Additional context
None.