[Feature]: add specific err for callbacks

[yaythomas]

What would you like?

aws/aws-durable-execution-sdk-js#441

Add CallbackTimeoutError and CallbackSubmitterError to provide clear, unambiguous error handling for callback operations. Replace errorClass with more flexible errorMapper in ChildConfig.

Changes:

• Add CallbackTimeoutError for callback timeout scenarios
• Add CallbackSubmitterError for submitter failures in waitForCallback
• Add errorMapper to ChildConfig for flexible error type mapping
• Remove errorClass from ChildConfig (replaced by errorMapper)
• Update callback.ts to throw CallbackTimeoutError for TIMED_OUT status
• Update waitForCallback to use errorMapper for consistent error types
• Update all promise combinators to use errorMapper
• Update fromErrorObject to reconstruct new error types
• Export CallbackTimeoutError and CallbackSubmitterError
• Update all tests to expect correct error types

Error types by operation:

• createCallback timeout -> CallbackTimeoutError
• createCallback failure -> CallbackError
• waitForCallback timeout -> CallbackTimeoutError
• waitForCallback failure -> CallbackError
• waitForCallback submitter failure -> CallbackSubmitterError

Possible Implementation

No response

Is this a breaking change?

No

Does this require an RFC?

No

Additional Context

No response