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Stdlib_unix: allow to block on locking a file instead of failing

Alain Mebsoutrequested to merge
alain@functori@lock-file into master

What

This MR allow the with_lock utility function to block instead of failing while taking a lock.

Why

This simplifies the code and removes duplication in the rollup node. The blocking lock file mechanism is also needed by the evm node in !14173 (merged).

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