Add yq to list of commands ignored for SC2016

[gkrimer]

Teach https://www.shellcheck.net/wiki/SC2016 about yq, which also has $var in expressions like jq:

yq '.metadata.name as $id | $id' deployment.yaml   # SC2016 today
jq '.metadata.name as $id | $id' deployment.json   # already allowed

This applies to both mikefarah/yq and kislyuk/yq (a jq wrapper). As with jq, the trade-off is missing '.x = "$VAR"' mistakes.

Written by Claude on behalf of @gkrimer.

[gkrimer]

Alternatively, we can restrict the check to the as $var syntax that yq and jq have for variable declaration. This is a more substantial change but it would provide a more targeted check. This is very much Claude's work in progress: gkrimer#1

As I don't know Haskell I'd need to spend time gaining an understanding of these changes.