feat(*): write to stderr for errors and warnings

[maksadbek]

BREAKING CHANGE: Warning logs are now written to stderr instead of stdout.

[derevnjuk]

@maksadbek you should describe the breaking changes as follows:

After the merge, a new major version (v13) will be released.

[orubin]

@maksadbek you should describe the breaking changes as follows:

After the merge, a new major version (v13) will be released.

@adirdidi @bararchy FYI, the logging fix will trigger v13 release - breaking change.

[derevnjuk]

@orubin not immediately ofc, we will release the v13 release candidate (i.e., v13.0.0-next.1) first. We can postpone the final release of v13 and maintain both v12.x and the v13.x.x-next.x for a while and you can plan other breaking changes and migration util this moment.

@maksadbek in that case, you need to keep working in next branch and use cherry-picks to port changes from next to main when needed instead of merge as before.

[adirdidi]

Will update you about v13 release, we may add one more feature to it (discovery).