Add JS package

I want to create a JS/TS package for the frontend side. It should be a simple query builder that doesn't do any fancy validation. It can be in a different repo, although I prefer to maintain all code in one place (sub directory).

The issue describes creating a new JS/TS package for a simple query builder, likely as a frontend counterpart to the Go RQL library. Start by examining the existing Go repository structure to understand the query language semantics. Determine if the package will be a separate repo or a subdirectory. 'Done' means a published npm package with basic query building functionality, but the scope and design are open-ended.

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