feat: generate machine secret

[stebenz]

Definition of Ready

• [ ] 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
• [ ] All non-functional requirements are met
• [ ] The generic lifecycle acceptance test passes for affected resources.
• [ ] Examples are up-to-date and meaningful. The provider version is incremented.
• [ ] Docs are generated.
• [ ] Code is generated where possible.

[swaroopar]

@stebenz Thank you for this. It is exactly what we are looking for.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 2.32558% with 42 lines in your changes are missing coverage. Please review.

Project coverage is 63.08%. Comparing base (e9153b9) to head (348a7e7). Report is 1 commits behind head on main.

Files	Patch %	Lines
zitadel/machine_user/funcs.go	2.43%	38 Missing and 2 partials :warning:
zitadel/helper/import.go	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #161 +/- ## ========================================== - Coverage 63.29% 63.08% -0.21% ========================================== Files 159 159 Lines 12850 12891 +41 ========================================== - Hits 8133 8132 -1 - Misses 3435 3475 +40 - Partials 1282 1284 +2 ``` | [Flag](https://app.codecov.io/gh/zitadel/terraform-provider-zitadel/pull/161/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zitadel) | Coverage Δ | | |---|---|---| | [acceptance-tests](https://app.codecov.io/gh/zitadel/terraform-provider-zitadel/pull/161/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zitadel) | `63.08% <2.32%> (-0.21%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zitadel#carryforward-flags-in-the-pull-request-comment) to find out more.

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.