[ base ] Add lists' infix-by functions, complementary to existing ones

[buzden]

Description

In Data.List we have

• prefixOfBy, isPrefixOfBy, isPrefixOf;
• suffixOfBy, isSuffixOfBy, isSuffixOf;
• but only isInfixOf,

which is a shame sometimes. I suggest adding those two lacking complementary functions.

Should this change go in the CHANGELOG?

• If this is a fix, user-facing change, a compiler change, or a new paper
  implementation, I have updated CHANGELOG.md (and potentially also
  CONTRIBUTORS.md).