feat(collator): optimize and fix messages collection for execution

[SmaGMan]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 6.54762% with 157 lines in your changes missing coverage. Please review.

Project coverage is 42.77%. Comparing base (b151e38) to head (1a57042).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
collator/src/collator/messages_reader/mod.rs	0.00%	79 Missing ⚠️
...r/src/collator/messages_reader/internals_reader.rs	0.00%	44 Missing ⚠️
...r/src/collator/messages_reader/externals_reader.rs	31.25%	21 Missing and 1 partial ⚠️
...lator/src/collator/messages_reader/reader_state.rs	11.11%	8 Missing ⚠️
collator/src/collator/messages_buffer.rs	0.00%	3 Missing ⚠️
collator/src/collator/do_collate/execute.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #567      +/-   ##
==========================================
- Coverage   42.96%   42.77%   -0.19%     
==========================================
  Files         276      276              
  Lines       51019    51072      +53     
  Branches    51019    51072      +53     
==========================================
- Hits        21918    21848      -70     
- Misses      27988    28107     +119     
- Partials     1113     1117       +4     

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