Guard against all uncaught exceptions in the serial executor block

[pmathew92]

Summary

Ports the serial-executor exception guard (#970) onto the v4_development branch as its own feature.

• Adds runCatchingOnExecutor helper to BaseCredentialsManager, wrapping each serialExecutor.execute { } body in a catch (Throwable) -> onFailure(UNKNOWN_ERROR) safety net so unexpected errors surface as a failure callback instead of being swallowed on the executor thread.
• Wraps all 3 CredentialsManager and all 3 SecureCredentialsManager execute blocks; removes the now-redundant trailing catch (RuntimeException) blocks while keeping the domain-specific catches (AuthenticationException, CredentialsManagerException, IncompatibleDeviceException, CryptoException).
• Brings SecureCredentialsManager.continueGetApiCredentials to parity with the other two blocks by mapping a save failure to STORE_FAILED (rather than letting it fall through to the new UNKNOWN_ERROR net).

This is the v4 port of the change merged to main in #970; reconciled onto v4's restructured credentials managers and test imports (org.mockito.kotlin.*).

Test plan

• ./gradlew :auth0:compileDebugKotlin
• ./gradlew :auth0:testDebugUnitTest — full suite green
• 5 new tests in CredentialsManagerTest (98 total), 4 new in SecureCredentialsManagerTest (131 total), 0 failures
• Verified wrap/catch parity against fix : Guard against all uncaught exception in the serial executor block #970 (3+3 execute blocks wrapped, STORE_FAILED 3=3, domain catches match)

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