Functional Linux port available.

[JakeSays]

I've created a Linux port of ESE. It uses io_uring in place of IOCP, and an NLS library extracted from wine. Log compression is implemented with zstd. All of the unit tests (included the embedded ones) pass, and there is a set of integration tests that cover about 98% of the testable api (some functions are either not implemented by ese or irrelevant on linux).

Currently it builds and all tests pass on x86_64 glibc, x86_64 musl, arm64 glibc, and arm64 musl.

The repository is here: eselinux
The NLS repo is here: libnls

Note that currently the on-disk format is not Windows compatible. The linux port uses a different format version number to prevent cross os corruption.