[cassandra] Allow turning off tags/logs indexing

[joe-elliott]

Which problem is this PR solving?

• Resolves Allow disabling of log indexing #1905

Short description of the changes

• Moved all index filtering options under index
• Added 3 options to drop all tags of a certain type
• Converted log fields filter into a configurable "drop all" filter
• Fixed bug where ChainedTagFilter was not calling FilterLogFields correctly
• Added appropriate tests

[codecov]

Codecov Report

Merging #1915 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1915      +/-   ##
==========================================
+ Coverage   98.45%   98.45%   +<.01%     
==========================================
  Files         198      198              
  Lines        9706     9740      +34     
==========================================
+ Hits         9556     9590      +34     
  Misses        114      114              
  Partials       36       36

Impacted Files	Coverage Δ
...cassandra/spanstore/dbmodel/tag_filter_drop_all.go	100% <100%> (ø)
plugin/storage/cassandra/factory.go	100% <100%> (ø)	⬆️
.../storage/cassandra/spanstore/dbmodel/tag_filter.go	100% <100%> (ø)	⬆️
plugin/storage/cassandra/options.go	100% <100%> (ø)	⬆️

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[joe-elliott]

Manually tested in our environment. Dropping draft status.