[9.x] Default uuid column name

[jasonmccreary]

Similar to #35534 and the id() column, this defaults the column name of uuid() to uuid for developer convenience.

Before

$table->uuid('uuid');

After

$table->uuid();

Note: I did not do this for foreignUuid as it uses a column name prefix to establish the related model.

[jasonmccreary]

If merged, I'll open a PR for the docs.