Make it easy to use `clangd` (i.e. an IDE) with the engine (especially post-RBE) about flutter HOT 4 CLOSED

In my opinion, consuming raw compile_commands.json generated by gn isn't feasible for tools like clangd, since gn dumps raw commands with all the flags used to build the target. I don't work at Google and therefore don't use Goma or RBE, but I encountered the same issue a long time ago and developed a solution to parse compile_commands.json and filter out flags unnecessary for consuming tools.

You can find my script here: https://gist.github.com/bc-lee/8707d1e62d14f8bb6bd30ef6e67f1625

The script modifies the compile_commands.json file by removing flags that clangd doesn't need. It's not perfect, but it works for me. At least it's much easier than maintaining a separate output folder to avoid using unnecessary flags with clangd.

Example usage:
$ gn gen --export-compile-commands out/out_dir && parse-compile-commands out/out_dir

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Thanks @bc-lee, that certainly is an option, maybe even the best one.

I'll let the rest of the engine team weigh in, but I appreciate the contribution!

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Duplicate of #147767, and closed by flutter/engine#53135.

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