Support REL range bounds as expressions

[carminite]

Thanks to @royi-luo for answering my dumb questions :D

Description

REL ranges ([:label*x..y]) can now be bounded by LITERAL and PARAM expressions

Fixes #4135
Associated docs (issue or PR):

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[carminite]

kU_Properties can be parsed as oC_Expressions (through kU_StructLiteral) so REL filters like [:WORKED_WITH* {year: 1988}] interpret the map as the lower/upper bound. Is there any way to solve this that doesn't require a new type of "literal expression" to be defined?