immediately update views on first write in batch and add flush

[juls0730]

This pull request updates subscribers' views on the first write in a batch, enabling the pattern of:

const data = // a triplit subscription view
triplit.insert('foo', { bar: 'baz' })
console.log(data) // data will now have { bar: 'baz' } in its elements, when it previously wouldnt

It also adds a new flush function that will manually update reactive views and optionally sync writes to the server if that is desired. This enables patterns like this:

for (let i = 0; i < 100; i++) {
  triplit.insert('foo', { bar: `baz ${i}` })
}
await triplit.flush() // required to flush every write, since only the first of a batch is written by default, so baz 1-99 would be missing
console.log(data) // has every newly inserted element (baz 0-99)

The performance should be on par with the previous implementation according to my testing since the first push (that enables the first pattern I discussed) only updates local reactive views. If you have any questions, please let me know.

[vercel]

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