feat(sort): add the ability to disable sort toggling

[crisbeto]

Adds the ability for a mat-sort-header or mat-sort instance to be disabled, preventing the user from changing the sorting direction.

Fixes #8622.

[andrewseguin]

Should be disabled

[crisbeto]

I didn't go with disabled, because while it is a component, the selector is still an attribute so it's not super obvious what you're disabling.

[andrewseguin]

Yeah, just a funny consequence of our rules - might loop in @jelbourn for confirmation on this but as a rule, components don't prefix

[jelbourn]

It should be just disabled because the selector is dash-case (matches mat-button and mat-tab-nav-bar). It's only when the selector is camelCase that inputs should be prefixed.

[crisbeto]

Switched it to disabled @andrewseguin.

[andrewseguin]

There's an open PR similar to this (#7786) but yours includes a way to disable the MatSort so let's go with that.

[andrewseguin]

LGTM

[mdrafee03]

apply with mat-sort-header, [disabled] = "condition to be true"
Example
<mat-header-cell *matHeaderCellDef mat-sort-header [disabled]="!sortedColumns.includes(col)"> {{ helper.extract(labels, col) }} </mat-header-cell>

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