[9.x] Added dropForeignIdFor method to match foreignIdFor method

[bretto36]

Hi All

So i recently started using these foreignIdFor methods to make my migrations look so much nicer. But i found that the down() method of the migration didn't look as nice

Currently i'm writing

$table->foreignIdFor(\App\Models\Item::class);

and then to drop

$table->dropForeign('item_id')

This change introduces

$table->dropForeignIdFor(\App\Models\Item::class);

And also the constrained scenario

$table->foreignIdFor(\App\Models\Item::class)->constrained();

This change introduces

$table->dropConstrainedForeignIdFor(\App\Models\Item::class);

[driesvints]

@bretto36 I believe the handling of $column in dropForeignIdFor is incorrect here. Please see #43753