feat: Add import-dir command for bulk importing API specifications

[Caesarsage]

• Introduced a new command import-dir to allow users to import multiple API specification files from a specified directory.
• Implemented functionality to scan for supported file types (.yaml, .yml, .json, .xml) and handle recursive imports.
• Added unit tests to ensure the reliability of the import process.
• Updated documentation to include usage examples and details about the new command.

This feature enhances the CLI's capabilities for managing API specifications efficiently.

Related issue(s)

Fixes #171

Addresses: #97 (Support for directory import)

[Harsh4902]

@Caesarsage Thank you so much for this PR. It's actually a very good implementation for import-dir command. I have some concerns:

• Maybe we can use existing API sspecifications which are already present in /sample/ directory.
• We are thinking to move all import related commands as sub-command like import url, import dir, so maybe we can integrate this after the migration. It will basically reduce the overhead after the new implementation.

[Caesarsage]

Kindly review @lbroudoux @hash

@Caesarsage Thank you so much for this PR. It's actually a very good implementation for import-dir command. I have some concerns:

• Maybe we can use existing API sspecifications which are already present in /sample/ directory.
• We are thinking to move all import related commands as sub-command like import url, import dir, so maybe we can integrate this after the migration. It will basically reduce the overhead after the new implementation.

Thank you for the feedback and for reviewing the PR! @Harsh4902
I can update the PR to use only the existing API specifications in the /samples/ directory and remove any extra sample files I added for demonstration/testing.

for the command restructure, I agree it would be more efficient to integrate the import-dir functionality after the import commands are refactored into sub-commands.

Please let me know when the migration is complete, and I’ll be happy to rebase and adapt this PR to fit the new structure.

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