rofl-appd-localnet: Add appd for Localnet

[matevz]

This PR:

• adds a simple sgx-raw ROFL that exposes appd functionalities. The produced .orc is meant to be executed in unsafe mode inside sapphire-localnet. Once appd is exposed this way, it can be used to test tdx-containers based ROFLs by spinning up sapphire-localnet, mounting the volume containing the appd unix socket and running the tests on the host with full Localnet key derivation and blockchain functionalities.
• adds CI for releasing the rofl-appd-localnet .orc for bundling inside the sapphire-localnet docker image.
• refactors test-rust to test-rust-rofl-appd-localnet, test-rust-hello-contract and test-rust-oas20-contract so they can be run in parallel

Requires oasisprotocol/cli#684
Implements #2142
Supersedes #2419
Related: oasisprotocol/oasis-web3-gateway#823

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.60%. Comparing base (c469f37) to head (03785c4).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
rofl-appd-localnet/src/main.rs	0.00%	18 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2430      +/-   ##
==========================================
- Coverage   48.65%   48.60%   -0.06%     
==========================================
  Files         224      225       +1     
  Lines       16110    16128      +18     
==========================================
  Hits         7839     7839              
- Misses       8211     8229      +18     
  Partials       60       60              

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[kostko]

Added some comments, also tests seem to be failing.

[kostko]

Some minor nits, otherwise looks good.