Support multiple & nested flows

[ohltyler]

Description

This PR adds initial support for persisting multiple flows in a single drag-and-drop ReactFlow workspace - specifically, Ingest and Search parent/group components.

To validate this approach will work with the future drag-and-drop support, a lot of POC work was done. Details on all of those code changes are in the dev branches and list of commits, which is tracked in #118. It is also included in the respective meta issue. For now, we don't include it to keep the commit history and PR simpler and more trackable.

Details of changes:

• adds IngestGroupComponent and SearchGroupComponent as available ReactFlow node types
• updated (currently hardcoded) set of nodes and edges to showcase multiple flows
• reduces scope of ReactFlow context. Previously, this was done at the global/app level. This reduces it to only the base Workspace component. It also enhances it by using the ootb hook useReactFlow(). It also opens up the door for adding multiple reactflow contexts on the same view/page, if we want to in the future
• Refactoring WorkspaceComponent and related components into a single workspace_components dir alongside the added group components.
• Disables node deletion for now
• Adds placeholder data in the component details section when selecting the parent component

Demo video:

static-with-validation.webm

Check List

• [x] Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license. For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 21.92%. Comparing base (5231f09) to head (840454c).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #119 +/- ## ========================================== + Coverage 21.67% 21.92% +0.25% ========================================== Files 54 56 +2 Lines 826 812 -14 Branches 81 82 +1 ========================================== - Hits 179 178 -1 + Misses 643 630 -13 Partials 4 4 ```

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