Rest api endpoint improvement

[obiPlabon]

PR Type

What kind of change does this PR introduce?

• New Feature

Description

• Listings create, edit, and delete endpoint
  • directorist/v2/listings
  • directorist/v2/listings/{listing_id}
• Plans read endpoint
  • directorist/v1/plans
  • directorist/v1/plans/{plan_id}
• Orders read endpoint
  • directorist/v1/orders
  • directorist/v1/orders/{order_id}
• Builder read endpoint
  • directorist/v1/builder/{builder_tab} // 'all-listings', 'listing-form', 'search-form', 'single-listing'
• Temporary media uploader endpoint
  • directorist/v1/temp-media-upload
• Misc refactoring

Any linked issues

Checklist

• My code follows the WordPress coding standards