[audit] use of coerceBooleanProperty

[willshowell]

Bug, feature request, or proposal:

Suggesting library-wide audit

Expected

Consistent use

Currently

At least two boolean inputs (1 2) do not use it

Motivation

#6344 (comment), #6097 (comment)

Is there anything else we should know?

IMO it should be removed entirely as it encourages misuse of bindings that won't translate outside this library. For reference, the original commit used it in the form of @BooleanFieldValue().

[jelbourn]

We should use it consistently everywhere. It's necessary at the very least to make things like disabled, readonly, required, and checked work correctly.

My long-term goal is to convince core to do angular/angular#8968

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