Remove unix dependency in irmin-test

[patricoferris]

This PR removes the lwt.unix dependency in irmin-test allowing the test-suite package to be compiled into more exotic locations (the browser, unikernels etc.).

This is how we managed to test the irmin-server port to use websockets so the client could be in the browser. I then tested a few different backends (an updated irmin-indexeddb and irmin.mem) using the testsuite in this repository with a live version available.

Note this PR, in order to run in the browser, requires mirage/alcotest#348.

[codecov-commenter]

Codecov Report

Merging #1860 (a6038c6) into main (347d885) will decrease coverage by 0.00%.
The diff coverage is 68.96%.

❗ Current head a6038c6 differs from pull request most recent head e897241. Consider uploading reports for the commit e897241 to get more accurate results

@@            Coverage Diff             @@
##             main    #1860      +/-   ##
==========================================
- Coverage   63.97%   63.96%   -0.01%     
==========================================
  Files         129      129              
  Lines       15479    15475       -4     
==========================================
- Hits         9902     9899       -3     
+ Misses       5577     5576       -1     

Impacted Files	Coverage Δ
src/irmin-test/store_watch.ml	30.76% <50.00%> (+0.13%)	⬆️
src/irmin-test/common.ml	70.16% <61.90%> (-0.24%)	⬇️
bench/irmin-pack/trace_collection.ml	83.11% <100.00%> (-0.64%)	⬇️
src/irmin-test/store.ml	94.82% <100.00%> (+<0.01%)	⬆️

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[icristescu]

Thanks!

[samoht]

@patricoferris could you rebase your PR? That seems like a very good change, I'm happy to have it in the next irmin release :-)

[samoht]

(it also seems related to @metanivek's #1948)

[metanivek]

@patricoferris my recent changes did touch similar files as this PR but looking at the conflicting files I think the only thing you need to know is that you can delete the test/irmin-unix directory. lmk if anything else comes up on rebase though. happy to help.

[patricoferris]

@patricoferris could you rebase your PR? That seems like a very good change, I'm happy to have it in the next irmin release :-)

Great, all rebased :))

[samoht]

Thanks!