[SearchQueryBuilder] Support special character escapement for search bar filter keys

[aliu39]

Follow-up on thread here: #83968 (comment)
Arose from a PR for feature flags search, where : characters in the flag key conflicted with our search syntax (e.g. key=val is submitted to API as key:val, key>val is key:>val)

@malwilley:

What I meant was, we already have logic that will "escape" filter values by wrapping them in quotes when they contain things like spaces, quotes, parens, etc. We could do something similar with filter keys where we wrap them when necessary, which would mean that you wouldn't have to wrap them in quotes in the config up front

[getsantry]

Routing to @getsentry/product-owners-issues for triage ⏲️