Add Node Manager

[camielvs]

Description

Adds a new top-level class NodeManager to handle conversion between static ReactFlow node ids and potentially non-static task ids.

Node ids are a randomly generated unique id internal to the app and specifically used to maintain ReactFlow state. The Node Manager creates, stores and, when necessary, removes these ids and maps them 1:1 with the relevant refId, where refId is any key (though typically a taskId, inputName or outputName.

ReactFlow Node ids will now be related to tasks as follows:

• node id <--Node Manager--> task id
• node id <--Node Manager--> input name
• node id <--Node Manager--> output name

Task inputs & task outputs are are mapped via their Handle relative to the task/object they are on.

No change to app functionality. Implementation of the node manager will come in upstack PRs.

Related Issue and Pull requests

Progresses https://github.com/Shopify/oasis-frontend/issues/261

Type of Change

• Improvement

Checklist

• I have tested this does not break current pipelines / runs functionality
• I have tested the changes on staging

Screenshots (if applicable)

Test Instructions

This PR adds a bunch of code without tying it into the existing app so it cannot be test through UI.

Review the test file to see if the core functionality works as expected.

Additional Comments

[camielvs]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• useNodeManager Hook #1082 : 2 dependent PRs (#930 , #1004 )
• Provide Node Manager #1081
• Add Node Manager #929 👈 (View in Graphite)
• Groundwork for Id Conversions #1090
• Separate IONodeData type from TaskNodeData type #928
• Refactor Dynamic Node Callbacks #927
• master

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