feat: add Solana address creation via WASM

Implement wasm-solana package for Solana address generation using official
Solana SDK crates (solana-pubkey, solana-keypair) compiled to WebAssembly.
This is Phase 1 of replacing JavaScript Solana dependencies to mitigate
npm supply chain attack risks.

Architecture follows wasm-utxo patterns:
- Core types wrap official Solana SDK with extension traits (PubkeyExt, KeypairExt)
- Thin WASM bindings (src/wasm/*.rs) expose types to JavaScript
- TypeScript wrappers (js/*.ts) provide idiomatic camelCase APIs

Components:
- Pubkey: base58 encoding/decoding, is_on_curve() for PDA detection
- Keypair: creation from 32-byte seed or 64-byte Solana secret key format

Build tooling:
- Makefile matching wasm-utxo's wasm-pack workflow
- TypeScript configs for ESM and CJS output

Verified compatibility with BitGoJS sdk-coin-sol test vectors.

Ticket: BTC-2927

Author: lcovar

.github/workflows/build-and-test.yaml

@@ -36,6 +36,7 @@ jobs:
           workspaces: |
             packages/wasm-utxo
             packages/wasm-bip32
+            packages/wasm-solana
           cache-on-failure: true
 
       - name: Setup Node
@@ -85,6 +86,8 @@ jobs:
             packages/wasm-utxo/js/wasm/
             packages/wasm-bip32/dist/
             packages/wasm-bip32/js/wasm/
+            packages/wasm-solana/dist/
+            packages/wasm-solana/js/wasm/
           retention-days: 1
 
   test:
@@ -94,14 +97,17 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        package: [wasm-bip32, wasm-utxo]
+        package: [wasm-bip32, wasm-utxo, wasm-solana]
         include:
           - package: wasm-utxo
             needs-wasm-pack: true
             has-wasm-pack-tests: true
           - package: wasm-bip32
             needs-wasm-pack: false
             has-wasm-pack-tests: false
+          - package: wasm-solana
+            needs-wasm-pack: false
+            has-wasm-pack-tests: false
     steps:
       - uses: actions/checkout@v4
         with: