Improve transaction logging

[d4rken]

Add explicit tags to allow for type specific filtering.
Move OkHttp webrequest logging to VERBOSE (from INFO).

This also fixes a few broken log statements we had, i.e.

Timber.v(TAG, msg) // <- would only print TAG, msg treated as input for non-existend placeholders.
// instead of
Timber.tag(TAG).v(msg)

Spawned by EXPOSUREAPP-2267.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities (and 0 Security Hotspots to review)
0 Code Smells

73.8% Coverage
0.0% Duplication