Add genBlockHeader and related functions to Test.Gen.Cardano.Api.Typed

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Changelog

- description: |
    Add `genBlockHeader` and related functions to `Test.Gen.Cardano.Api.Typed`.
# uncomment types applicable to the change:
  type:
  # - feature        # introduces a new feature
  # - breaking       # the API has changed in a breaking way
  - compatible     # the API has changed but is non-breaking
  # - optimisation   # measurable performance improvements
  # - refactoring    # QoL changes
  # - bugfix         # fixes a defect
  # - test           # fixes/modifies tests
  # - maintenance    # not directly related to the code
  # - release        # related to a new release preparation
  # - documentation  # change in code docs, haddocks...

Context

I have ported these directly from hydra. Let me know if you would change anything. cardano-scaling/hydra#1987

How to trust this PR

Highlight important bits of the PR that will make the review faster. If there are commands the reviewer can run to observe the new behavior, describe them.

Checklist

• Commit sequence broadly makes sense and commits have useful messages
• New tests are added if needed and existing tests are updated. See Running tests for more details
• Self-reviewed the diff

[locallycompact]

Is this OK?

[carbolymer]

@locallycompact yes, but there are some test failures: https://github.com/IntersectMBO/cardano-api/pull/834/checks?check_run_id=41827008602

[locallycompact]

I think this is good now.

[locallycompact]

Signed