reiz.reizql: META() matcher for searching on parent types

[isidentical]

No description provided.

[isidentical]

Related: edgedb/edgedb#2255

[isidentical]

I intend to merge this is as is while skipping the 2 new tests due to upstream EdgeDB issues. When they are resolved I'll remove the # reiz: skip tags

[codecov-io]

Codecov Report

Merging #34 (5b858b5) into master (bc8edbb) will increase coverage by 0.24%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##           master      #34      +/-   ##
==========================================
+ Coverage   90.42%   90.66%   +0.24%     
==========================================
  Files          31       31              
  Lines        1775     1853      +78     
==========================================
+ Hits         1605     1680      +75     
- Misses        170      173       +3     

Impacted Files	Coverage Δ
reiz/reizql/compiler/functions.py	81.57% <28.57%> (-11.97%)	⬇️
reiz/ir/builder.py	91.52% <62.50%> (-4.56%)	⬇️
reiz/serialization/serializer.py	90.97% <66.66%> (-0.57%)	⬇️
reiz/ir/backends/edgeql.py	98.23% <100.00%> (+0.02%)	⬆️
reiz/reizql/compiler/codegen.py	95.83% <100.00%> (+1.00%)	⬆️
reiz/reizql/compiler/state.py	96.90% <100.00%> (+2.28%)	⬆️
reiz/reizql/parser/grammar.py	100.00% <100.00%> (ø)
reiz/reizql/parser/parse.py	88.17% <100.00%> (ø)
reiz/serialization/transformers.py	99.13% <100.00%> (+0.24%)	⬆️
test_cases/runner.py	93.67% <100.00%> (+3.25%)	⬆️
... and 3 more

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