feat: import key loading method

[siujamo]

• Import RSA public key with modulus and exponent;
• Import EC public key with x, y and curve name.

[Copilot]

Pull Request Overview

This PR improves key loading functionality by introducing new methods for importing RSA and EC public keys based on provided key components.

• Updated AuthzeroTokenResolver to use the newly renamed ECKeyLoader.
• Renamed and enhanced RSAKeyLoader and ECKeyLoader to support key import via modulus/exponent and x/y/curve parameters respectively.
• Updated the KeyLoader interface to include default methods for RSA and EC public key loading.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
simple-jwt-authzero/src/main/java/com/onixbyte/simplejwt/authzero/AuthzeroTokenResolver.java	Updated import and instantiation to use ECKeyLoader.
key-pair-loader/src/main/java/com/onixbyte/security/impl/RSAKeyLoader.java	Renamed class and added RSA public key loading from modulus/exponent.
key-pair-loader/src/main/java/com/onixbyte/security/impl/ECKeyLoader.java	Renamed class and added EC public key loading from x, y coordinates and curve name.
key-pair-loader/src/main/java/com/onixbyte/security/KeyLoader.java	Added default methods for RSA and EC public key loading.

Comments suppressed due to low confidence (1)

key-pair-loader/src/main/java/com/onixbyte/security/impl/RSAKeyLoader.java:152

• [nitpick] Local variable names with a leading underscore (e.g., '_modulus' and similarly for '_exponent') are unconventional in Java. Consider renaming them (e.g., 'modulusBigInt' and 'exponentBigInt') to improve readability.

var _modulus = new BigInteger(1, urlDecoder.decode(modulus));

[zihluwang]

@siujamo good to go