Перенести mrrun в opensource

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tool path:
https://github.com/ydb-platform/ydb/tree/main/ydb/library/yql/tools/mrrun

secret knowledge:
gateways.conf https://paste.nebius.dev/paste/99d15ee2-01aa-43db-bb10-20e3d7fcd2e2.html
fs.conf https://paste.nebius.dev/paste/1707a55c-81dc-40e7-85b1-6e326fbcbf96.html