Add messaging pages

[stnguyen90]

What does this PR do?

This PR is a base for all messaging-related PRs so that the incoming PRs are smaller and easier to review.

Test Plan

Tests will be done on the incoming PRs

Related PRs and Issues

PR tree:

1. Add messaging overview route #596
   1. Add messaging providers route #602
      1. Support creating email messages #630
         1. Add message detail page #632
            1. Add support for creating SMS messages #633
               1. Add support for creating push messages #636
                  1. Add messaging topics route #597
                     1. Update push and SMS previews to look like a mobile device #643
                        1. Update Filters to not allow filtering on all columns #654
2. Fix create provider enabled #704
   1. Add a route to show user targets #712
      1. Allow empty topic descriptions #716
      2. Fix targets modal #734
         1. Update search subscribers placeholder #735
         2. Add support for saving messages as draft #737

Have you read the Contributing Guidelines on issues?

Yes

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