feat: add WASMI dependency

[mvadari]

High Level Overview of Change

This PR adds Wasmi as a dependency to rippled, in preparation for Smart Escrows.

Context of Change

Splitting up #5600 into more managably reviewable chunks

XLS-102

Type of Change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Refactor (non-breaking change that only restructures code)
• [ ] Performance (increase or change in throughput and/or latency)
• [ ] Tests (you added tests for code that already exists, or your new feature included in this PR)
• [ ] Documentation update
• [ ] Chore (no impact to binary, e.g. .gitignore, formatting, dropping support for older tooling)
• [ ] Release

API Impact

N/A

Test Plan

CI passes and everything compiles in properly without error.

Future Tasks

Additional PRs for the rest of the Smart Escrow functionality

[Bronek]

@mvadari we would normally upload our custom recipes to https://github.com/XRPLF/conan-center-index

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 79.1%. Comparing base (4565cc2) to head (90e0bbd).

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #5999   +/-   ##
=======================================
  Coverage     79.1%   79.1%           
=======================================
  Files          839     839           
  Lines        71377   71377           
  Branches      8342    8342           
=======================================
  Hits         56425   56425           
  Misses       14952   14952           

see 4 files with indirect coverage changes

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