Split Realtime Viewership API into Now and Time Series APIs

[leszko]

As discussed in Discord, we split /data/views/active API into two separate APIs:

• /data/views/now
• /data/views/internal/timeSeries

fix https://linear.app/livepeer/issue/ENG-1799/revisit-viewsactive-api

[codecov]

Codecov Report

Attention: Patch coverage is 10.63830% with 42 lines in your changes are missing coverage. Please review.

Project coverage is 28.57143%. Comparing base (3cf1819) to head (7f5de96).

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main        #186         +/-   ##
===================================================
- Coverage   28.64721%   28.57143%   -0.07578%     
===================================================
  Files              6           6                 
  Lines            377         392         +15     
===================================================
+ Hits             108         112          +4     
- Misses           256         266         +10     
- Partials          13          14          +1     

Files	Coverage Δ
views/client.go	21.48148% <71.42857%> (+2.10164%)	⬆️
views/clickhouse.go	0.00000% <0.00000%> (ø)

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Files	Coverage Δ
views/client.go	21.48148% <71.42857%> (+2.10164%)	⬆️
views/clickhouse.go	0.00000% <0.00000%> (ø)

[linear]

ENG-1799 Revisit `/views/active` API

[victorges]

LGTM