Inline InputPadder

[pravdomil]

What does this PR do?

inlines InputPadder class from gmflow/utils

because I cannot get utils.utils to import:
ModuleNotFoundError: No module named 'utils.utils'; 'utils' is not a package.
but the gmflow module works just fine?!

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Who can review?

@SingleZombie

[HuggingFaceDocBuilderDev]

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[pravdomil]

...

[yiyixuxu]

gentle pin @SingleZombie

[yiyixuxu]

@pravdomil can you fix the quality tests?

[pravdomil]

try now

[yiyixuxu]

can we fix tests?

[pravdomil]

now should be ok

[pravdomil]

ready

[yiyixuxu]

still not fixed .......

[pravdomil]

try now