Add mining blocks at a certain interval

[ivpavici]

A new block should be created at a fixed time interval selected by the user.

This functionality exists in Anvil and Katana:

• evm_setIntervalMining in https://book.getfoundry.sh/reference/anvil/#special-methods
• https://book.dojoengine.org/toolchain/katana/mining#interval-mining

[mikiw]

I can take it since it's related to time and blocks

[FabijanC]

in CLI it could be governed by:

--block-generation <ON_DEMAND|PERIODIC>
--block-generation-period # only usable with --block-generation PERIODIC

[mikiw]

requires a merge of https://github.com/0xSpaceShard/starknet-devnet-rs/pull/480/files but I already started based on this branch

[mikiw]

I'll implement --block-generation-on <transaction|demand|<SECONDS> as discussed on the chat.