[5.7] Add --step to migrate:fresh command

[connectkushal]

The migrate:fresh is a useful command, but currently there is no option to repeat the migration in steps using migrate:fresh when required.

This pr adds the missing feature, which can be run by adding --step option to migrate:fresh
php artisan migrate:fresh --step

It is a non breaking change and works as intended with other options as well.

[SjorsO]

This was rejected before: #24939

[connectkushal]

Heres a use case. When working on a new feature on a project which has many migrations, sometimes I need to run migrate:fresh --seed once, but subsequently it would have been very convenient to just rollback the last or last few migrations instead of re-running all of them if the migrations were run in steps. Not doing so i have to wait for all the migrations to rerun along with seeds which takes a lot of time. Or i have to drop tables manually, and run migrate --step which is not very neat.

One of the reasons why i need to run migrate:fresh once is sometimes, if the some migration was messed up, the table is created or updated in db, but it doesn't show up in the migrate:status. From this point I cannot work with migration again unless i do a migrate:fresh, but then i cannot rollback the last migration if i want to as migrate fresh doesn't have the option to re run migrations in steps.

Currently getting this done by a simple bash script, but would rather prefer adding simple --step to the existing command over custom scripts.