Add "sort by" field option to Omnibar

[lainvineyard]

Description of the Change

This commit adds a "sort by" attribute option to the Omnibar. When set while the extra attribute is also enabled, the Omnibar will show a drop down that allows the user to select how they would like their results ordered.

Verification Process

Added modified Omnibar to a test page and performed various test submissions.

A few example shortcodes:

[idx-omnibar styles="1" extra="1" min_price="1" sort_by="newest"]
[idx-omnibar styles="1" extra="1" min_price="1" sort_by="bda"]
[idx-omnibar styles="1" extra="1" min_price="1" sort_by="sqftd"]

omnibar-sort-by-test.zip can be installed on a test WordPress installation to try out the new functionality.

Release Notes

"Sort by" attribute option added to IMPress Omnibar block and shortcode. Use the "sort_by" attribute when adding the Omnibar via shortcode and set it to one of the Sort Order options mentioned on https://support.idxbroker.com/s/article/Search-Queries-For-Custom-Forms-And-Saved-Links

Review

Pull Requests must have the sign-off of two other developers and at least one of these must be an IDX Broker team member.