fix(fxconfig/cli): enforce --submit and --wait flag dependencies

[ARYANPATEL-BIT]

Description

Background & Motivation

Currently, in the fxconfig namespace create and update CLI commands, the --submit flag documentation states that it "requires --endorse". However, this constraint is not enforced programmatically.

As a result:

• Using --submit without --endorse simply returns early and saves an unsigned transaction, completely ignoring the user's intent to submit.
• Using --endorse without --submit succeeds in endorsing the transaction but offers no console output or guidance to the user on what to do next.

What was changed

• Flag Validation: Added a Validate() method to namespaceDeployFlags in flags.go to enforce the following dependencies:
  • --submit strictly requires --endorse.
  • --wait strictly requires --submit.
• Command Updates: Updated namespace_create.go and namespace_update.go to execute namespace.Validate() early in the RunE flow.
• UX Improvements: Added a console print statement that triggers when a user specifies --endorse without --submit. It informs the user that the transaction was endorsed successfully and instructs them to use fxconfig tx submit later.
• Documentation: Updated the CLI --help strings (Long documentation) to clarify exactly how these lifecycle flags interact.

Testing

• Added comprehensive unit tests in flags_test.go covering all valid and invalid flag permutations.
• Ran existing test suites to ensure no regressions in current functionality.

FIXES: #219