Undirected query for single label Nodes/Rels

[aziz-mu]

This PR adds support for undirected queries of the form:
MATCH (A)-[N]-(A) ...
where A and N refer to only one node / rel table, respectively.

[codecov]

Codecov Report

Patch coverage: 98.07% and project coverage change: +0.14 🎉

Comparison is base (e9e27a1) 91.85% compared to head (2a8cbf5) 91.99%.

❗ Current head 2a8cbf5 differs from pull request most recent head a63026a. Consider uploading reports for the commit a63026a to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1542      +/-   ##
==========================================
+ Coverage   91.85%   91.99%   +0.14%     
==========================================
  Files         689      696       +7     
  Lines       24668    24861     +193     
==========================================
+ Hits        22658    22872     +214     
+ Misses       2010     1989      -21     

Impacted Files	Coverage Δ
...rocessor/operator/scan/generic_scan_rel_tables.cpp	93.47% <93.75%> (ø)
.../processor/operator/scan/generic_scan_rel_tables.h	100.00% <100.00%> (ø)
src/planner/join_order_enumerator.cpp	98.13% <100.00%> (+<0.01%)	⬆️
src/processor/mapper/map_extend.cpp	97.97% <100.00%> (+0.38%)	⬆️

... and 39 files with indirect coverage changes

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