Add NIFSGadgetTrait, implement Mova's NIFSGadget, adapt Nova NIFSGadget into NIFSGadgetTrait (#173)

* add new NIFSGadgetTrait

* implement Mova's NIFSGadget

* refactor Nova NIFSGadget to fit into the new NIFSGadgetTrait

* abstract NIFSGadget related tests for all implementors of
  NIFSGadgetTrait to avoid duplicated code in the tests between the
  different Nova variants gadget tests

* frontends/noir update mimc usage since it has been migrated from
  noir's std into it's own repo

frontends/src/noir/test_folder/test_mimc/Nargo.toml

@@ -5,4 +5,4 @@ authors = [""]
 compiler_version = ">=0.30.0"
 
 [dependencies]
-
+mimc = { tag = "v0.1.0", git = "https://github.com/noir-lang/mimc" }

frontends/src/noir/test_folder/test_mimc/src/main.nr

@@ -1,6 +1,4 @@
-use dep::std;
-
 pub fn main(x: pub [Field; 1]) -> pub Field {
-  let hash = std::hash::mimc::mimc_bn254(x);
+  let hash = mimc::mimc_bn254(x);
   hash
 }