Renaming RelationTracker to DatabaseInfo + updated method.

[isoos]

No description provided.

[isoos]

/cc @wolframm: I believe it is fine to revert the mostly-unused public sync parsing methods to no use any type decoding (as it was in a previous stable), but use the async version while actively decoding the message.

/cc @ankane: I think DatabaseInfo may work as a better name and concept for querying the type information - even on demand, I am a bit undecided on which direction it will take. However I think it would be feasible if these instance would get either a dedicated connection pool from the user setting them up, or automatically create a pool with max-instance of 1 and use it if/when the query is needed.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 59.25926% with 11 lines in your changes missing coverage. Please review.

Project coverage is 84.72%. Comparing base (12e1cbf) to head (acd8609).
Report is 30 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/src/v3/database_info.dart	20.00%	8 Missing ⚠️
lib/src/messages/logical_replication_messages.dart	62.50%	3 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #372      +/-   ##
==========================================
- Coverage   86.60%   84.72%   -1.88%     
==========================================
  Files          28       31       +3     
  Lines        2964     3182     +218     
==========================================
+ Hits         2567     2696     +129     
- Misses        397      486      +89     

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