[FE-16108] Add bbox filter for contour lines layer

[johallar]

Polygon layer includes the bbox filter in _genVega and passes along, line layer does not so this moves the bbox query generation to a utility and uses in polygon and line raster layer mixins.

This also fixes the query when using geo points instead of lat/lng, convo: https://heavy-ai.slack.com/archives/C045DL4QM0D/p1670271981480729

Merge Checklist

:wrench: Issue(s) fixed:

• [ ] Author referenced issue(s) fixed by this PR:
• [ ] Fixes #0

:smoking: Smoke Test

• [ ] Works in chrome
• [ ] Works in firefox
• [ ] Works in safari
• [ ] Works in ie edge
• [ ] Works in ie 11

:ship: Merge

• [ ] author crafted PR's title into release-worthy commit message.