Introduce new APIs to read EC private keys and public keys

[Bhashinee]

Purpose

This PR is to introduce 4 new APIs to the Crypto module to interact with the private keys and public keys signed with "EC" algorithms.

Fixes: ballerina-platform/ballerina-library#5821

Examples

Newly introduced APIs,

Decode a 'EC' private key

crypto:PrivateKey privateKey = check crypto:decodeEcPrivateKeyFromKeyStore(keyStore, "keyAlias", "keyPassword");

Decode a 'EC' public key

crypto:PublicKey publicKey = check crypto:decodeEcPublicKeyFromTrustStore(trustStore, "keyAlias");

Generate a SHA384withECDSA based signature

byte[] signature = check crypto:signSha384withEcdsa(data, privateKey);

Verify a SHA384withECDSA based signature

boolean validity = check crypto:verifySha384withEcdsaSignature(data, signature, publicKey);

Checklist

• Linked to an issue
• Updated the changelog
• Added tests
• Updated the spec
• Checked native-image compatibility

[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (0c97dc2) 86.25% compared to head (6f1b573) 87.52%.

Files	Patch %	Lines
.../io/ballerina/stdlib/crypto/nativeimpl/Decode.java	90.00%	2 Missing and 3 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #533      +/-   ##
============================================
+ Coverage     86.25%   87.52%   +1.27%     
- Complexity       76       93      +17     
============================================
  Files            16       16              
  Lines           422      465      +43     
  Branches         56       65       +9     
============================================
+ Hits            364      407      +43     
  Misses           47       47              
  Partials         11       11              

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[MohamedSabthar]

LGTM