(app) Chore: add flow and flowconfig to app

[mcous]

In a holding pattern on this one; it may be simply dropped in favor of #508 if we can get it in quickly enough

overview

Adds flow and necessary setup to the app and app documentation.

This PR includes:

• Chore work
• Bug fixes
• Backwards-compatible feature additions
• Breaking changes
• Documentation updates
• Test updates

changelog

• (Chore) Added flow and flow configuration to the app
• (Refactor) Renamed the types directory in components to interfaces
  • From an example @IanLondon sent me

review requests

Please test things out on your machines. @IanLondon we can also throw protocol designer in on this PR, too; lemme know.

[codecov]

Codecov Report

Merging #507 into v3a will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              v3a     #507   +/-   ##
=======================================
  Coverage   72.02%   72.02%           
=======================================
  Files         139      139           
  Lines        4879     4879           
  Branches        1        1           
=======================================
  Hits         3514     3514           
  Misses       1365     1365

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