`into cell-path` for conversions

Convert value to a cell-path.

Signature

> into cell-path {flags}

input	output
cell-path	cell-path
int	cell-path
list<any>	cell-path
list<record<value: any, optional: bool>>	cell-path

Convert integer into cell path

> 5 | into cell-path
$.5

Convert cell path into cell path

> 5 | into cell-path | into cell-path
$.5

Convert string into cell path

> 'some.path' | split row '.' | into cell-path
$.some.path

Convert list into cell path

> [5 c 7 h] | into cell-path
$.5.c.7.h

Convert table into cell path

> [[value, optional]; [5 true] [c false]] | into cell-path
$.5?.c

Converting a string directly into a cell path is intentionally not supported.