feat(rn): add stamping logic to android stamper

[moldy530]

Pull Request Checklist

• Did you add new tests and confirm existing tests pass? (yarn test)
• Did you update relevant docs? (docs are found in the site folder, and guidelines for updating/adding docs can be found in the contribution guide)
• Do your commits follow the Conventional Commits standard?
• Does your PR title also follow the Conventional Commits standard?
• If you have a breaking change, is it correctly reflected in your commit message? (e.g. feat!: breaking change)
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PR-Codex overview

This PR focuses on enhancing the NativeTEKStamperModule in the rn-signer project by adding Kotlin serialization support, improving key management, and implementing the stamp function for creating digital signatures.

Detailed summary

• Added kotlin.plugin.serialization to build.gradle.
• Introduced ApiStamp data class for serialization.
• Updated BUNDLE_KEY constants in NativeTEKStamperModule.
• Implemented the stamp function for signing payloads.
• Added private key handling with privateKeyToKeyPair.
• Integrated BouncyCastle as a security provider if not already present.

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Name	Status	Preview	Comments	Updated (UTC)
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[moldy530]

• fix(rn): get login working e2e #1132
• feat(rn): add stamping logic to android stamper #1131 👈 (View in Graphite)
• feat(rn): add bundle injection logic #1130
• feat(rn-signer): add key pair generation in android #1129
• feat(rn): add alpha react native signer impl #1128 : 1 other dependent PR (#1134 )
• main

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