feat: added raw output type for jfr and pprof

[mangglesh]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @mangglesh, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new 'raw' output type for the JFR (Java Flight Recorder) and Go Pprof profiling tools. This enhancement allows users to retrieve the unprocessed, raw profiling data directly, providing more flexibility for custom analysis or integration with other tools beyond the standard visualizations.

Highlights

• New Output Type Support: I've added 'Raw' as a supported output type for both the Jcmd (Java Flight Recorder) and PProf (Go Profiler) tools in the API definitions, allowing users to request unprocessed profiling data.
• JFR Raw Output Implementation: For JFR, I've implemented the logic to generate raw output by executing the jfr summary command on the collected .jfr files, providing a textual summary of the recording.
• Go Pprof Raw Output Implementation: For Go Pprof, I've enhanced the profiler to fetch both CPU and Heap profiles, convert them to a raw text format using go tool pprof --raw, and then combine them into a single raw output file.
• File Extension Handling: I've updated the file extension logic to correctly assign the .jfr extension to raw JFR outputs and refined the handling for various other Jcmd output types.

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[gemini-code-assist]

Code Review

This pull request adds support for a raw output type for both jfr and pprof profilers. The implementation for go_pprof has a critical regression where the nsenter command was removed, which will break profiling. I've also pointed out several medium-severity issues, including resource leaks. Please review the feedback, especially the critical items, to ensure the functionality works as expected.