Add Modifiers to query builder

[thecoolwinter]

What kind of change does this PR introduce?

Adds modifiers that are available in the supabase-js library

• limit
• order
• single
• range
• offset <- this last one isn't the js library but is available in the postgrest server and seems really useful

What is the new behavior?

Queries can now add modifiers when building, eg:

// Get 15 users and order by their name descending
client.from("users")
    .order("name", desc: true)
    .limit(15)

// Get one user
client.from("users")
    .single()

// Get posts after the 15th result until the 30th result
client.from("posts")
    .range(15, 30)

// Same as above, but uses the `offset` modifier.
client.from("posts")
    .offset(15)
    .limit(15)

[grdsdev]

awesome, thanks!