Commit 2023-03-13 12:12 b3e1613e

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feat: port CategoryTheory.ConnectedComponents (#2843)

Estimated changes

Modified Mathlib.lean

Created Mathlib/CategoryTheory/ConnectedComponents.lean

added def CategoryTheory.Component.ι

added def CategoryTheory.Component

added def CategoryTheory.ConnectedComponents

added def CategoryTheory.decomposedEquiv

added def CategoryTheory.decomposedTo

added theorem CategoryTheory.inclusion_comp_decomposedTo