Add EfficientLoFTR model

[sbucaille]

What does this PR do?

As discussed earlier, here is the implementation of EfficientLoFTR with their official weight.
This PR is an anticipation of the release of other weights like MatchAnything https://github.com/zju3dv/MatchAnything
Fixes #36354

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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• Did you write any new necessary tests?

Who can review?

@qubvel