`flow test` should deploy smart contracts defined in flow.json

Instructions

Issue To Be Solved

Currently we need to explicitly deploy a smart contract in the cadence unit or integration tests, e.g.:

import "FLIXRegistry"
...
...
access(all)
fun setup() {
    let flixRegistryErr = Test.deployContract(
        name: "FLIXRegistry",
        path: "../contracts/flix_registry.cdc",
        arguments: []
    )
...

In the above example FLIXRegistry cannot be referenced in the code before it was deployed with Test.deployContract, even if it is imported on the the top, and defined in the flow.json as follows:

{
  "contracts": {
    "FLIXRegistry": {
      "source": "cadence/contracts/flix_registry.cdc",
      "aliases": {
        "emulator": "0xf8d6e0586b0a20c7",
        "testing": "0x0000000000000007"
      }
    },
...

(Optional): Suggest A Solution

It could increase developer experience if smart contracts defined in the flow.json are readily available in the unit tests, so the developers only have to import those as dependencies.
Also it could keep the unit tests code more concise and clean.

(Optional): Context