chore: sync tools and stdio/tests from postman-mcp-server (#67)

* adding changes in package.json and server.json in order to publish to mcp registry * adding new line * Apply suggestion from @akira28 Co-authored-by: Andrea De Pirro <andrea.depirro@postman.com> * chore: sync tools, entrypoint, and tests from postman-mcp-server * fix: install newman * fixup! fix: install newman --------- Co-authored-by: Ruben <ruben.baraut@postman.com> Co-authored-by: Ruben Baraut <116556424+rubenbaraut@users.noreply.github.com> Co-authored-by: Andrea De Pirro <andrea.depirro@postman.com> Co-authored-by: garciasdos <25979809+garciasdos@users.noreply.github.com> Co-authored-by: Diego García <diego.garcia@postman.com>

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