fix: feed bloc query and add activities

[HayesGordon]

• Fixes adding to a fix lengthed list
• Changes the init behavior of queryEnrichedActivities (to allow it to be called again)

[codecov]

Codecov Report

Merging #207 (bc6f5b6) into master (90789df) will not change coverage.
The diff coverage is 100.00%.

❗ Current head bc6f5b6 differs from pull request most recent head 858766c. Consider uploading reports for the commit 858766c to get more accurate results

@@           Coverage Diff           @@
##           master     #207   +/-   ##
=======================================
  Coverage   76.94%   76.94%           
=======================================
  Files         139      139           
  Lines        4646     4646           
=======================================
  Hits         3575     3575           
  Misses       1071     1071           

Impacted Files	Coverage Δ
packages/faye_dart/lib/src/subscription.dart	76.92% <ø> (ø)
...es/stream_feed/lib/src/client/aggregated_feed.dart	94.28% <ø> (ø)
...ream_feed/lib/src/client/image_storage_client.dart	91.30% <ø> (ø)
...s/stream_feed/lib/src/client/reactions_client.dart	91.17% <ø> (ø)
...stream_feed/lib/src/client/stream_feed_client.dart	100.00% <ø> (ø)
...m_feed/lib/src/client/stream_feed_client_impl.dart	86.62% <ø> (ø)
...ckages/stream_feed/lib/src/core/api/batch_api.dart	1.49% <ø> (ø)
...es/stream_feed/lib/src/core/api/reactions_api.dart	96.82% <ø> (ø)
...eam_feed/lib/src/core/http/stream_http_client.dart	71.21% <ø> (ø)
...ages/stream_feed/lib/src/core/models/reaction.dart	97.22% <ø> (ø)
... and 12 more

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