Added OpGroup class to group together ops with the same names

[zrfisher]

Summary: Created an OpGroup class to group together OpInfo objects with the same name since all will be needed to generate the associated function implementation. Wrote test to ensure that Declarations.json can be parsed correctly to a map of OpGroups.

Reviewed By: raedle

Differential Revision: D40231866

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1 Ignored Deployment

| Name | Status | Preview | Updated | | :--- | :----- | :------ | :------ | | **playtorch** | ⬜️ Ignored ([Inspect](https://vercel.com/fbopensource/playtorch/HpyAGYdR2KUeJWwizdt3UumWs2Dk)) | | Oct 28, 2022 at 10:11PM (UTC) |

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This pull request was exported from Phabricator. Differential Revision: D40231866