implement json.numincrby

[romange]

implement json.numincrby
spec: https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/json-numincrby.html

specifically:

json.set foo $ '{ "e": 1.5 , "a": 1 }' 
json.NUMINCRBY foo $.a 1.1

returns "[2.1]"

and json.NUMINCRBY foo $.e 1 returns "[2.5]"
and json.NUMINCRBY foo $.e 1e10 returns "[1e+10]"

moreover,
json.NUMINCRBY foo $.e inf returns (error) OVERFLOW Addition would overflow

[romange]

json.set foo $ '{ "e": 1.5 , "a": 1 }' 
json.NUMINCRBY foo $.e 1.7e308

returns "[1.7e+308]"
but then if we call json.NUMINCRBY foo $.e 1.7e308 again we get
(error) OVERFLOW Addition would overflow because max double is ~ 1.8e308

[iko1]

This issue can be closed

[romange]

🚀