[index patterns] index pattern field editor with runtime field functionality

[mattkime]

Goal - provide editor for runtime fields that is used in index pattern management AND available for kibana apps.

Mocks - https://www.figma.com/proto/G7VYPbb20hzSo21C2mV3T3/Runtime-Fields?node-id=4331%3A16&viewport=-457%2C1073%2C0.12023100256919861&scaling=contain

• Move existing index pattern field editor (formatting, count, customLabel) into its own plugin and consume by index pattern management.
  • Will involve refactor of CRUD functionality - editor is currently doing save which is unwanted.
• Integrate runtime field editor, ability to add runtime fields [Runtime fields editor] Expose editor for consuming apps #82116

[elasticmachine]

Pinging @elastic/kibana-app-services (Team:AppServices)

[mattkime]

completed