Add PSS parameter encoding support in WolfCryptPssParameters

[cconlon]

This PR adds RSASSA-PSS parameter encoding support to WolfCryptPssParameters.

Encoding logic follows RFC 4055 default value semantics, fields matching ASN.1 defaults are omitted from DER encoding.

Fixes SunJCE test: security/cert/X509Certificate/GetSigAlgParams.java

[Copilot]

Pull Request Overview

This PR adds comprehensive RSASSA-PSS parameter encoding and decoding support to WolfCryptPssParameters, implementing RFC 4055 specification with proper default value semantics. The implementation correctly omits fields that match ASN.1 defaults from DER encoding.

Key Changes:

• Implements DER encoding/decoding for PSS parameters following RFC 4055 standards
• Adds ASN.1 utility methods for integer, OID, and NULL encoding/decoding
• Provides extensive test coverage with 20 new test cases covering various hash algorithms, salt lengths, and error conditions

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 8 comments.

File	Description
src/main/java/com/wolfssl/provider/jce/WolfCryptPssParameters.java	Implements PSS parameter encoding/decoding logic with RFC 4055 compliant default value omission
src/main/java/com/wolfssl/provider/jce/WolfCryptASN1Util.java	Adds ASN.1 utility methods for DER encoding/decoding of integers, OIDs, NULL values, and hash algorithm mappings
src/test/java/com/wolfssl/provider/jce/test/WolfCryptAlgorithmParametersTest.java	Adds comprehensive test coverage for PSS parameters including initialization, encoding, decoding, round-trip tests, and error cases

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