Adds bailing heuristic for symbol table calc + test

[anderson4j]

An attempt at a bailing heuristic. The first simple idea we have here, is to bail unless we write a non-letter/number.
This way, it's not until you have finished a label/reltype in queries like
MATCH (n:Person) (not triggered for P, Pe etc, but triggered at ) in the node pattern)
or
MATCH (n:Person)-[:KNOWS] (triggered at ]) in the rel pattern)
This both reduces unnecessary recalculations from using computer resources, but also prevents us from waiting for the calculation from an unfinished node pattern etc before starting the calculation for the finished pattern.

The downside is for example if one changes only the label of a node. Then one would not need to close the pattern/continue the path - heuristic would skip symbol table update - but the symbol table would actually be outdated

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Latest commit: 2f6a56a

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