fix: expose MF2 plugin config to external tooling

[jbroma]

Summary

• [x] - expose config to external tooling like Zephyr Cloud for adjusting the config during the build

Test plan

n/a

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: d7276f33e956285e2ab119e114a40bbe4295ddb4

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

This PR includes changesets to release 3 packages

| Name | Type | | ---------------------------- | ----- | | @callstack/repack | Patch | | @callstack/repack-dev-server | Patch | | @callstack/repack-init | Patch |

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| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **repack-website** | ⬜️ Ignored ([Inspect](https://vercel.com/callstack-team/repack-website/2YwnY3L2ccXCp1UW2Ucgcnra2hFA)) | | | Nov 19, 2024 4:43pm |