WebAssembly Integration PoC

[carlpulley-da]

• hello-world host function logging
• create-contract host function transaction tree
• fetch-contract host function transaction tree
• exercise-choice host function transaction tree
• AuthorizationChecker host function usage controls
• additional Speedy party checks
• daml-lf and Wasm data interoperability spike
• WasmEngine integration with Canton
• upgrading and data continuity spike
• error reporting between Scala/WASM host/export functions
• add in bazel support for compiling rust Wasm modules
• add in package management functionality

To run WasmRunner tests (that exercise current functionality) run:

bazel test //daml-lf/interpreter:tests_test_suite_src_test_scala_com_digitalasset_daml_lf_speedy_wasm_WasmRunnerTest.scala --test_output=streamed --cache_test_results=no 

TODO:

• use VersionedTransaction rather than PartialTransaction - avoids any need for SValue manipulations
  • the use of PartialTransaction greatly simplifies our implementation effort
  • SValue extraction from Value can be simplified by adding in dummy types for untyped records, variants and enums
• refactor canton dependencies so that ledger-api-value/value.proto and ValidateValue may be used - need to avoid a cyclic bazel dependency

Design Document Ref:

• https://docs.google.com/document/d/1RXwCVQ667096SNduHjrpiZCEEpTw2st1aicYEalx3kI/edit#heading=h.j1o9vy5fqmrz