Add support for a simple config based mapping to allow
for a generic namespace query layer with `ns` query param
to rewrite to supported hosts. This replaces the http
approach since it is a simple rewrite to avoid the risk
of problems with that service impacting streaming execution
of data.

This allows it to be used for APIs that only accept a query.
The main benefit is to support `:list,(,contextQuery,:cq,),:each`
pattern. It could be done with as `baseQuery,contextQuery,:and`,
but in some cases it is convenient for tools to use the same
pattern for tags and graph API.

Fix some additional unused warnings discovered with the
new compiler.

Try out dependabot for keeping actions up to date.

Bumps [actions/setup-java](https://github.com/actions/setup-java) from 3 to 4.
- [Release notes](https://github.com/actions/setup-java/releases)
- [Commits](actions/setup-java@v3...v4)

---
updated-dependencies:
- dependency-name: actions/setup-java
  dependency-version: '4'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '4'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>