Centralize converters for `MaxPool1D` and `einsum`

[gs-olive]

• Utilize new impl directory to centralize converters for key ops across FX compilation formats
• See feat: Module-Acceleration in Dynamo [5 / x] #1979, feat: Add support for general-purpose function acceleration in Dynamo [6 / x] #1980

[narendasan]

@gs-olive is this still blocked?

[gs-olive]

Pending discussion on the best location for converters such as those introduced in #1979, #1980. Is it preferable to move those converters to a central location even though the code that repairs the FX graph to add those ops is elsewhere?

[github-actions]

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[gs-olive]

Addressed in #2317

[gs-olive]

Completed on main for maxpool. Einsum pending.