feat: call contract method with mutiple params

[luizstacio]

Summary

• Fix encode for call a contract with multiple params;
• Add complementary tests on package provider
• Remove isStruct from the encoded interface

Contract example;

abi TestContract {
  fn foo(value: u64) -> u64;
  fn boo(value: TestStruct) -> TestStruct;
  fn barfoo(value: u64) -> u64;
  fn foobar(value: ()) -> u64;
  fn foobar_no_params() -> u64;
  fn sum(a: u64, b: u64) -> u64;
  fn sum_test(a: u64, test: SumStruct) -> u64;
  fn sum_single(test: SumStruct) -> u64;
  fn sum_multparams(a: u64, b: u64, c: u64, d: u64, e: u64) -> u64;
  fn echo_b256(a: b256) -> b256;
  fn add_ten(param: SingleParamStruct) -> u64;
}

[QuinnLee]

lgtm

Can you add an issue to add more struct tests on the abi coder? I think we may need to update/add more

[luizstacio]

lgtm

Can you add an issue to add more struct tests on the abi coder? I think we may need to update/add more

#171