feat: Implements fictional's someOf primitive

[dthyresson]

This PR implement's fictional's someOf which:

Takes in an identifying input value and an array of values, repeatedly picks items from that array a number of times within the given range. Each item will be picked no more than once.

someOf('id-23', [1, 2], ['red', 'green', 'blue'])
// =>
[
  'green'
]

This is useful when seeding string arrays seen here as tags in Prisma models like:

model Post {
  id        Int      @id @default(autoincrement())
  title     String
  content   String
  tags      String[]
}

While the following oneOf can be performed:

copycat.oneOf([tech, life, music, art, science]),

There was no way in copycat to make an array like ['tech', 'art'].

The someOf function now lets you generate deterministic collections.

[justinvdm]

Thank you for the PR @dthyresson! From your example, I can see how someOf() fits into copycat's API for the use cases we've been keeping in mind.