bug(MatSortHeader): Sort arrow does not match Material/MDC

[kseamon]

Reproduction

Steps to reproduce:
Compare
https://material.angular.io/components/sort/examples
with
https://material.io/components/data-tables#anatomy

Expected Behavior

Angular Material's sort header should match (or there should be an MDC-backed version).

Actual Behavior

They do not match

Environment

• Angular: 11
• CDK/Material: 11
• Browser(s): All
• Operating System (e.g. Windows, macOS, Ubuntu): All

[crisbeto]

Bonus points if we simplify the arrow so it doesn't have such a complex animation setup.

[rafaelss95]

@crisbeto it seems like you added area: material/paginator where it should be area: material/sort, no?