Add phpstan- prefixed ObjectCollection&\Traversable<> annotations

[nederdirk]

In the query baseclass generator, some @psalm-method lines were used, because PHPstan doesn't support prefixed @method-annotations currently (2021-07-12). The two tools have a good history of supporting each other's prefixes, so chances are that PHPstan will pick up the @psalm- prefixed annotations in the future.

[codecov-commenter]

Codecov Report

Merging #1766 (1c30980) into master (9d5c105) will decrease coverage by 0.00%. The diff coverage is 92.85%.

@@             Coverage Diff              @@
##             master    #1766      +/-   ##
============================================
- Coverage     87.87%   87.87%   -0.01%     
- Complexity     7823     7825       +2     
============================================
  Files           267      267              
  Lines         22522    22543      +21     
============================================
+ Hits          19792    19809      +17     
- Misses         2730     2734       +4     

Flag	Coverage Δ
5-max	87.87% <92.85%> (-0.01%)	:arrow_down:
7.4	87.87% <92.85%> (-0.01%)	:arrow_down:
agnostic	73.34% <85.71%> (-0.04%)	:arrow_down:
mysql	69.86% <92.85%> (+0.02%)	:arrow_up:
pgsql	69.80% <92.85%> (+0.02%)	:arrow_up:
sqlite	67.78% <92.85%> (+0.02%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/Propel/Generator/Builder/Om/ObjectBuilder.php	94.37% <88.88%> (-0.02%)	:arrow_down:
src/Propel/Generator/Builder/Om/QueryBuilder.php	91.93% <100.00%> (+0.03%)	:arrow_up:
src/Propel/Runtime/Formatter/OnDemandFormatter.php	82.14% <0.00%> (-2.18%)	:arrow_down:
src/Propel/Runtime/Formatter/ArrayFormatter.php	84.94% <0.00%> (-0.93%)	:arrow_down:
...rc/Propel/Runtime/Connection/ConnectionWrapper.php	96.29% <0.00%> (-0.64%)	:arrow_down:
src/Propel/Runtime/Map/TableMap.php	93.01% <0.00%> (-0.12%)	:arrow_down:
src/Propel/Runtime/ActiveQuery/ModelCriteria.php	94.82% <0.00%> (-0.11%)	:arrow_down:
src/Propel/Runtime/Collection/Collection.php	95.27% <0.00%> (ø)
src/Propel/Runtime/Formatter/AbstractFormatter.php	76.19% <0.00%> (ø)
...c/Propel/Runtime/ActiveQuery/BaseModelCriteria.php	95.58% <0.00%> (ø)
... and 4 more

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[nederdirk]

[approved] Apart from small alignment issues

Fixed!