Added LineFileTagCombiner

[gberg617]

Summary

• This PR is a feature
• Adds a Lumberjack combiner that combines messages only when the line number, file name, and tag are equal. If texts are not equal, only one text message will remain after being combined. This can be useful in some circumstances where we have a similar message that is emitted many times from the same source code location, but may be slightly different in its text content (e.g. if it includes the rank in the message). In some of these cases, the user may want to just see one message, even if the content is slightly different.

[gberg617]

This class is nearly identical to the TextTagCombiner, with the exception of the criteria used to determine whether the message should be combined.

[bmhan12]

Thanks @gberg617!

Be sure to update the ReadTheDocs documentation for the Combiner class to include LineFileTagCombiner, the .rst file is located at src/axom/lumberjack/docs/sphinx/combiner_class.rst.

[bmhan12]

ReadTheDocs link to changes for this PR: https://axom.readthedocs.io/en/feature-bergel1-line_file_tag_combiner/axom/lumberjack/docs/sphinx/combiner_class.html

[kennyweiss]

Thanks @gberg617 !

Please also update the RELEASE_NOTES

[gberg617]

Thanks @gberg617 !

Please also update the RELEASE_NOTES

I added a bullet under the "unreleased" section.