Upgrading `julia-actions/setup-julia` CI step to @v2

Adding `MLJTransforms` in `test/runtests.jl`

Fixing test suite by adding `MLJTransforms` as extra dependency

Setting Julia LTS version in CI pipeline, and upgrading cache job

Merge pull request #45 from JuliaAI/default-logger

typo

typo

update codecov to @v4

update codecov badge

update readme example for tuning and default logger

fix typo in README.md

Bump to `v0.5.0`

Increasing number of threads on CI test step

Attempt to accelerate CI by caching python dependencies installation

Enhancing concurrent instructions for logging and moving `_logging_channel` to `logging_channel`