Improve logging

[pblazej]

Turns out that the configuration closure:

• must be run before any logs (expected) - this is kinda fixable
• may run once per process, so will break for anyone using the same framework... and we cannot do any default setup

If we need the flexibility anyway, maybe it's better to drop the swift-logging right now...

My assupmtions:

• we use pure OSLog by default (info or warning)
• we can easily enable rtc internal logs via the same channel
• we can easily provide our custom implementation

[github-actions]

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