Tezt/Teztale: add Teztale module in lib_tezos

What

Add helpers in order to run teztale server and archiver in tezt scenarii.

Manually testing the MR

The only test currently using this new module is:

dune exec tezt/tests/cloud/main.exe -- cloud dal -v --log-file /tmp/log --producers 2 --stake 1,1 --teztale --localhost

Running it (likely with --tezt-cloud SOME_USERNAME --dockerfile-alias saroupille), you can check that teztale server is registering info visiting http://127.0.0.1:30007/head.json