Support StringView for binary operators

[tlm365]

Which issue does this PR close?

Part of #12180.

Rationale for this change

Support StringView for binary operators like ~, !~, etc.

What changes are included in this PR?

If Utf8View is in any side of binary operators, we COERCE to Utf8. This behaviour will remain until native StringView support is implemented.

Are these changes tested?

Yes.

Are there any user-facing changes?

No.

[dharanad]

I plan to review this later today.