Add map bridge lifecycle events for Listings With Map sync

[RabbiIslamRony]

PR Type

What kind of change does this PR introduce?

• Bugfix
• Security fix
• Improvement
• New Feature
• Refactoring (no functional changes, no api changes)
• Build related changes
• Text changes
• Other... Please describe:

Description

Adds the Directorist core map bridge needed by the Listings With Map extension sync work.

What changed:

1. Adds a provider-neutral DirectoristMapBridge API.
2. Dispatches public map events for map ready, viewport changed, and marker click.
3. Wires Google Maps and OpenStreetMap/Leaflet map flows into the bridge.
4. Preserves existing legacy map behavior while exposing new lifecycle data.
5. Includes rebuilt legacy JS bundles.

How to test:

1. Install this core branch with the paired Listings With Map extension branch.
2. Open /map-bi-directional-filtering-demo/.
3. Confirm map ready, viewport movement, and marker click behavior works with the extension.
4. Confirm legacy map pages still render without console errors.

Dependency note:

• This core PR is required by the Listings With Map extension PR.
• Extension PR: https://github.com/sovware/directorist-listings-with-map/pull/19
• Merge order: merge this core PR first, then merge the extension PR.

YAML/template check:

• Core .github YAML files were parsed successfully.
• Core PR body follows .github/pull_request_template.md.

Any linked issues

Fixes #

Checklist

• My code follows the WordPress coding standards