v0.0.2 - JavaDoc comments & Single Record Flow Input added

[jamessimone]

• added single record input variable to invocable
• cleaned up a few things, including dangling references to apex-rollup brought about by having copied some files
• added JavaDoc style comments in a few places in the codebase where downstream Apex dev consumers may benefit from some additional intellisense

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This discussion was created from the release v0.0.2 - JavaDoc comments & Single Record Flow Input added.