[WIP] Parsing of command-line arguments is broken

[Copilot]

• [x] Analyze the issues with the jsonpointer command-line tool
• [x] Understand the differences between v1 and v2 behavior
• [x] Create test files to verify current behavior
• [x] Modify bin/jsonpointer to handle both use cases:
  • [x] Make first positional argument a file path by adding backward compatibility
  • [x] Add -e/--expression option for direct pointer expressions
  • [x] Fix the -f/--pointer-file option
  • [x] Add proper error handling for file not found case
• [x] Update the help text to be clear and unambiguous
• [x] Test the changes with various input combinations
• [x] Update documentation to reflect the changes

Fixes #43.

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[stefankoegl]

@copilot rebase

[Copilot]

@copilot rebase

Rebase completed successfully. The branch has been rebased onto the latest master (602d29a).