[Merged by Bors] - feat(Filter/Basic): add EventuallyEq.congr_{left,right}

[urkud]

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[github-actions]

PR summary ceb7088518

Import changes for modified files

No significant changes to the import graph

Import changes for all files

Files	Import difference

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Declarations diff

+ EventuallyEq.congr_left
+ EventuallyEq.congr_right

You can run this locally as follows

## summary with just the declaration names:
./scripts/declarations_diff.sh <optional_commit>

## more verbose report:
./scripts/declarations_diff.sh long <optional_commit>

[j-loreaux]

bors d+

[mathlib-bors]

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[urkud]

bors merge

[mathlib-bors]

Pull request successfully merged into master.

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