feat: Add --tag flag to filter services in tsuru service list

[prbn021]

The tsuru-client can now use the tsuru API's tag filtering feature for services instances. The "tsuru service list" command now supports the -g or --tag flags like tsuru service list -g key=value. I based this improvement on the way tsuru-client does the tsuru app list command.

[crgisch]

LGTM 👍

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 77.77778% with 2 lines in your changes missing coverage. Please review.

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Files with missing lines	Patch %	Lines
tsuru/client/services.go	77.77%	1 Missing and 1 partial ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #234   +/-   ##
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  Coverage        ?   72.90%           
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  Files           ?       54           
  Lines           ?     9807           
  Branches        ?        0           
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  Hits            ?     7150           
  Misses          ?     1750           
  Partials        ?      907           

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