fix: Implement gogoproto customtype to secp256r1 keys

[facundomedica]

Description

These 2 types are being used as customtypes in the proto files, but to do it they need to implement this specific interface.

Closes: #19956

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Author Checklist

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Summary by CodeRabbit

• New Features
  • Enhanced JSON support for private and public keys, including marshaling and unmarshaling capabilities.
• Tests
  • Added tests for JSON functionality in key handling.

[coderabbitai]

Walkthrough

Walkthrough

The recent updates involve enhancements to the secp256r1 key handling in a cryptographic library, focusing on improving JSON serialization and deserialization. These changes include the addition of methods for marshaling and unmarshaling, as well as updates to key generation and unmarshaling logic, aiming to enhance interoperability and data handling within cryptographic operations.

Changes

File Path	Change Summary
crypto/keys/secp256r1/privkey.go, crypto/keys/secp256r1/pubkey.go	Added base64 encoding, new marshaling methods, updated key generation and unmarshaling.
crypto/keys/secp256r1/privkey_internal_test.go, crypto/keys/secp256r1/pubkey_internal_test.go	New tests for JSON marshaling and unmarshaling of keys.

Assessment against linked issues

Objective	Addressed	Explanation
[#19956]: Fix the export command failure related to secp256r1.ecdsaPK type	❓	It's unclear if the marshaling updates directly address the panic during export as the specific error might relate to type conversion rather than marshaling itself. Further investigation is needed to confirm.

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Recent Review Details

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Commits

Files that changed from the base of the PR and between ae57709 and 3e04a7c.

Files selected for processing (1)

• CHANGELOG.md (1 hunks)

Additional Context Used

Path-based Instructions (1)

CHANGELOG.md (1)

Pattern **/*.md: "Assess the documentation for misspellings, grammatical errors, missing documentation and correctness"

Additional comments not posted (1)

CHANGELOG.md (1)

116-116: The changelog entry is clear and correctly links to the PR that introduced the change. It succinctly describes the enhancement made in the crypto module.

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[testinginprod]

lgtm; although we should not continue supporting custom types x.x