Fix: Make tests deterministic

[alienx5499]

This PR resolves issue #34 by making tests deterministic and removing network dependencies for the short test suite.

Changes

Skip network-dependent tests in short mode

Added testing.Short() checks to skip network-dependent tests when running go test -short:

• TestEarlyDecryptionWithDuration
• TestEarlyDecryptionWithRound
• TestDecryptVariousChainhashes
• TestDecryptStrict
• TestInteropWithJS
• Test_WrapUnwrap

Add deterministic test vectors

Added two new deterministic test functions that use fixed network data without requiring network access:

• TestDeterministicEncryptionDecryption - Tests encryption/decryption using the tlock API
• TestDeterministicTimeLock - Tests TimeLock/TimeUnlock functions directly

Interop tests

The existing TestInteropWithJS already provides interop testing with tlock-js library using known test vectors.

Testing

• go test -short ./... - All tests pass, network tests skipped
• go test ./... - All tests pass, including network tests

Benefits

• Faster test runs in CI/CD (use go test -short)
• Deterministic test vectors for reliable testing
• No network dependency for most tests
• Easy to run tests without internet connectivity

Closes #34

[AnomalRoil]

LGTM, thanks