Pantsbuild: Add BUILD dependencies for logging.conf

[cognifloyd]

This PR has commits cherry-picked from #6202

I'm working towards getting pants to run our tests via pytest. While running unit tests, I found that the logging.conf files depend on python code, but pants cannot infer dependencies in conf files.

For example, this logging.conf snippet uses 3 classes from st2common.logging.formatters:

st2/st2stream/conf/logging.conf

Lines 32 to 44 in b534bf2

	[formatter_simpleConsoleFormatter]
	class=st2common.logging.formatters.ConsoleLogFormatter
	format=%(asctime)s %(levelname)s [-] %(message)s
	datefmt=
	[formatter_verboseConsoleFormatter]
	class=st2common.logging.formatters.ConsoleLogFormatter
	format=%(asctime)s %(thread)s %(levelname)s %(module)s [-] %(message)s
	datefmt=
	[formatter_gelfFormatter]
	class=st2common.logging.formatters.GelfLogFormatter
	format=%(message)s

And this snippet uses st2common.log.ConfigurableSyslogHandler:

st2/st2stream/conf/syslog.conf

Lines 14 to 18 in b534bf2

	[handler_syslogHandler]
	class=st2common.log.ConfigurableSyslogHandler
	level=DEBUG
	formatter=syslogVerboseFormatter
	args=()

Recording these dependencies for every conf file would be very repetitive, though, so I added 3 pants macros to simplify defining the dependencies in BUILD metadata:

• st2_logging_conf_file
• st2_logging_conf_files
• st2_logging_conf_resources