chore!: adopt log/slog, drop go-kit/log

[tjhop]

The bulk of this PR was automated by the following script which is being used to aid in converting the various exporters/projects to use slog:

https://gist.github.com/tjhop/49f96fb7ebbe55b12deee0b0312d8434

Other changes include:

• removing unneeded linter settings for go-kit/log
• enabling sloglint linter

[tjhop]

cc: @SuperQ