feat: add in BlockType enum for controlling block number during emulation

[Autoparallel]

Idea

Updated from a comment below:

I think we should externalize this more and make it more than just an Option. Perhaps an enum for this along the lines of:

pub enum BlockType {
     UserControlled,
     RandomlySampled(f64, u32),
}

• UserControlled: will give the user the ability to make calls such as client.mine_block() and client.set_block_timestamp().
• Randomized(f64, u32): would give the user the the Poisson chosen block sizes with the block rate via the f64 inner and we would let the block times update via the u32 inner.
• None: The user would not update the blocks ever.

This BlockType can go into the EnvironmentParameters.

Other details

We should probably try to implement this in some sort of RPC-like way such as listed in the Anvil documentation. For example, we can implement the request:

"evm_mine"

We should link this issue to #464.

Since blocks are not actually mined per se, we can maybe just implement a method on the RevmMiddleware such as next_block so that any clients may access this.

---

For those who will not need this feature, having the block number increment is just another chance for a bug a bit of overhead. Also, it relies on the user knowing what the block rate setting is doing.

- [ ] Add in an option for the rate_parameter when creating an environment.

[0xJepsen]

I'll take this, and add it to #417

[Autoparallel]

I'll take this, and add it to #417

I just saw this now -- we should not add it to that PR. We should do it the right way and introduce it a bit later.

[Autoparallel]

I think we should handle this differently after the other feedback to include the ability to mine blocks with some kind of admin control. I can add this in the middleware.

[Autoparallel]

I think we should externalize this more and make it more than just an Option. Perhaps an enum for this along the lines of:

pub enum BlockType {
     UserControlled,
     Randomized(f64, u32),
     None,
}

• UserControlled: will give the user the ability to make calls such as client.mine_block() and client.set_block_timestamp().
• Randomized(f64, u32): would give the user the the Poisson chosen block sizes with the block rate via the f64 inner and we would let the block times update via the u32 inner.
• None: The user would not update the blocks ever.

This BlockType can go into the EnvironmentParameters.