Automatically deploy entrypoint, and make it available in the hre

[Amxx]

The ERC4337 Entrypoint is a very common contract that is part of the expected blockchain environment. This PR introduces a hardhat task that automatically configures the test environment to include this contract.

This is enabled automatically in hardhat.config.js (which loads all files in the hardhat/ folder. In the community repository, we can enable that by by doing

require("@openzeppelin/contracts/hardhat/common-contracts.js");

Note: if needed in the future, we can have this evolve to include things like the ENS registrar, the beacon chain deposit contract, ...

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