Add Foreign Key Constraint with tests

[marcotas]

• Create

In Column

table.bigInteger('user_id')
    .references('id')
    .on('users')
    .onDelete('cascade')
    .onUpdate('set null');

In Table

table.foreign('user_id')
    .references('id')...

• Update

In Column

table.bigInteger('user_id')
    .references('id')
    .on('users')
    .onDelete('cascade')
    .onUpdate('set null')
    .change();

In Table

table.foreign(...)...

• Delete

table.dropForeign(columns: ['user_id']);
table.dropForeign(names: ['test_user_id_fk']);