feat:Business logic exception categorized as features

[Sathish1891]

Summary of Changes

** Implemented Structured Exception Handling:**

• Created a base FeatureException class for managing common feature-related errors.
• Developed specific exceptions, such as TransfersException, to handle errors related to the transfers feature.

Introduced Enums for Features and Error Descriptors:

• Added Feature enum to centralize available features (e.g., TRANSFERS, REMOTE_DEPOSITS, PAYMENTS).
• Added ErrorDescriptor enum to standardize error descriptors (e.g., INSUFFICIENT_FUNDS, ACCOUNT_NOT_FOUND).

Enhanced Clarity and Maintainability:

• Organized exception handling for better clarity and consistency across the application.
• Improved type safety by using enums, ensuring only valid feature names and error descriptors are used.

- Documentation:

• Provided comprehensive JavaDoc comments for classes and methods to facilitate understanding and usage.

[tessstoddard]

I don't think we need a FeatureMapper class. The Feature enum contains these strings already. And it's overriding the toString() method to return the name. Could probably use that instead https://github.com/mxenabled/path-core/blob/master/common/src/main/java/com/mx/path/core/common/request/Feature.java#L113

[mattnichols]

The feature should just be provided as a constructor arg. No need to map anything.

[mattnichols]

Suggested change

	public class TransfersException extends FeatureException {
	public class TransferException extends FeatureException {

[mattnichols]

I think it would be more consistent to make there singular.

[mattnichols]

I don't think you need this. Just convert the enum to a string when placing in header.

Suggested change

protected String getFeatureName() {

[mattnichols]

Suggested change

	private final String feature;
	private final Feature feature;

[mattnichols]

Suggested change

	withHeader("MX-Feature", feature);
	withHeader("MX-Feature", feature.toString());

[mattnichols]

Same with this. Just store as an enum and convert to a string when placing in header.

Suggested change

	private final String errorDescriptor;
	private final ErrorDescriptor errorDescriptor;

[mattnichols]

Suggested change

	withHeader("MX-Feature-Error", errorDescriptor);
	withHeader("MX-Feature-Error", errorDescriptor).toString();

[mattnichols]

Suggested change

	super(userMessage, Feature.TRANSFERS, errorDescriptor.getDescriptor());
	super(userMessage, Feature.TRANSFERS, errorDescriptor);

[mattnichols]

Suggested change

	protected FeatureException(String userMessage, Feature feature, String errorDescriptor) {
	protected FeatureException(String userMessage, Feature feature, ErrorDescriptor errorDescriptor) {

[mattnichols]

This looks like a good start. 👍