feat(oss): get eden's thrift building for on OSS, including py3 and rust support

[ben--]

WARNING: This may need massaged for the internal build to continue working

This diff cleans up the EdenFS thrift implementation and gets it working properly in the OSS build supporting.

Tested through building Sapling/EdenFS (requires other fixes to run clean):

act --container-architecture linux/x86_64 -W .github/workflows/edenfs_linux.yml

[facebook-github-bot]

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