[test] Add full support for EVM contract and core events

[m-Peter]

Description

• Setup the test environment to allow imports of the EVM system contract.
• Introduce a new CoreEvents contract, to expose event definition for core Flow & EVM events.

Examples:

import Test
import CoreEvents

access(all)
fun test() {
    let account = Test.createAccount()

    let typ = Type<CoreEvents.AccountCreated>()
    let events = Test.eventsOfType(typ)
    Test.expect(events.length, Test.beGreaterThan(1))

    let accountCreatedEvent = events[0] as! CoreEvents.AccountCreated
    Test.assertEqual(
        Address(0x0000000000000006),
        accountCreatedEvent.address
    )
}

---

• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• Code follows the standards mentioned here
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels