feat: add custom dial options to grpc connection

[HaimKortovich]

Adds the possibility to provide custom dial option for the grpc connection

Definition of Ready

• [ ] I am happy with the code
• [ ] Short description of the feature/issue is added in the pr description
• [ ] PR is linked to the corresponding user story
• [ ] Acceptance criteria are met
• [ ] All open todos and follow ups are defined in a new ticket and justified
• [ ] Deviations from the acceptance criteria and design are agreed with the PO and documented.
• [ ] No debug or dead code
• [ ] My code has no repetitions
• [ ] Critical parts are tested automatically
• [ ] Where possible E2E tests are implemented
• [ ] Documentation/examples are up-to-date
• [ ] All non-functional requirements are met
• [ ] Functionality of the acceptance criteria is checked manually on the dev system.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 0.00%. Comparing base (891b673) to head (4557d8e).

Files	Patch %	Lines
pkg/client/zitadel/client.go	0.00%	5 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #325 +/- ## ===================================== Coverage 0.00% 0.00% ===================================== Files 76 76 Lines 77377 77382 +5 ===================================== - Misses 77377 77382 +5 ```

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[github-actions[bot]]

:tada: This PR is included in version 2.2.0 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket:

[livio-a]

@HaimKortovich thanks for adding that possibility. If you like to get a gift from us, please write an email to hi@zitadel.com