[feature] #1425: Wasm helper crate

[mversic]

Description of the Change

Smartcontract example:

#![no_std]
#![no_main]

use iroha_wasm::{data_model::prelude::*, prelude::*};

#[iroha_wasm]
#[allow(clippy::needless_pass_by_value)]
fn _entry_point(_account_id: AccountId) {
    let new_account_id = AccountId::test("mad_hatter", "wonderland");
    let register_isi = RegisterBox::new(NewAccount::new(new_account_id));

    Instruction::Register(register_isi).execute();
}

The pattern I used for testing to inject mocked objects is something I saw in the mockall crate. I like it because it doesn't infect the external API unlike the pattern we use with traits. I previously used this crate successfully, although I think I encountered some bugs but didn't investigate into it.

Problems

• including iroha_wasm in the workspace seems to affect cfg(test) resolution
• iroha_wasm it has to be build with nightly compiler

Issue

Closes #1425

Benefits

Internal are hidden from the user. All user has to do is annotate one of their methods with iroha_wasm

Possible Drawbacks

Usage Examples or Tests [optional]

Alternate Designs [optional]

[codecov]

Codecov Report

Merging #1816 (a143433) into iroha2-dev (d4dc200) will increase coverage by 0.53%.
The diff coverage is 100.00%.

@@              Coverage Diff               @@
##           iroha2-dev    #1816      +/-   ##
==============================================
+ Coverage       77.85%   78.38%   +0.53%     
==============================================
  Files             148      148              
  Lines           21501    21511      +10     
==============================================
+ Hits            16739    16862     +123     
+ Misses           4762     4649     -113     

Impacted Files	Coverage Δ
crypto/src/hash.rs	97.72% <ø> (ø)
crypto/src/signature.rs	83.66% <ø> (-0.40%)	⬇️
data_model/src/lib.rs	68.78% <ø> (ø)
data_model/src/merkle.rs	93.75% <ø> (ø)
core/src/smartcontracts/wasm.rs	97.99% <100.00%> (+0.05%)	⬆️
data_model/src/metadata.rs	90.04% <100.00%> (ø)
data_model/src/query.rs	33.24% <100.00%> (ø)
core/src/block_sync.rs	89.30% <0.00%> (-1.26%)	⬇️
p2p/src/peer.rs	82.03% <0.00%> (ø)
... and 3 more

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[mversic]

should the function #fn_name receive account_id as a parameter?

[appetrosyan]

That could break cargo chef in the iroha2-dev docker file. Are you sure you want to exclude it?