fix: allow overriding generated headers from options

[mrlubos]

Closes https://github.com/hey-api/openapi-ts/issues/963

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🦋 Changeset detected

Latest commit: a756987ad396fd7e68cc5eff63f6615bffef3782

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ------------------- | ----- | | @hey-api/openapi-ts | Patch |

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Codecov Report

Attention: Patch coverage is 97.43590% with 1 line in your changes missing coverage. Please review.

Project coverage is 76.66%. Comparing base (c39ee74) to head (a756987). Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/openapi-ts/src/compiler/types.ts	95.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1065 +/- ## ========================================== + Coverage 76.56% 76.66% +0.10% ========================================== Files 103 103 Lines 11268 11280 +12 Branches 1135 1135 ========================================== + Hits 8627 8648 +21 + Misses 2634 2628 -6 + Partials 7 4 -3 ``` | [Flag](https://app.codecov.io/gh/hey-api/openapi-ts/pull/1065/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=hey-api) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/hey-api/openapi-ts/pull/1065/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=hey-api) | `76.66% <97.43%> (+0.10%)` | :arrow_up: | 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=hey-api#carryforward-flags-in-the-pull-request-comment) to find out more.

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commit: a756987