feat: add @bitgo/wasm-ton package

Rust/WASM package for TON (The Open Network) transaction building,
parsing, and signing. Uses toner v0.7.3 (pure Rust TON SDK) compiled
to wasm32-unknown-unknown.

Supports all wallet-platform intent types:
- payment (native TON + jetton token transfers)
- fillNonce (nonce hole filling via self-send)
- consolidate (native + token, 7-day expiry)
- delegate (TonWhales, SingleNominator, MultiNominator)
- undelegate (TonWhales, SingleNominator, MultiNominator)
- vesting contract variants for Whales deposit/withdraw

Architecture follows wasm-solana/wasm-dot patterns:
- Two-layer rule: core Rust logic in src/, thin WASM bindings in src/wasm/
- TypeScript wrappers in js/ with bigint for all monetary amounts
- Transaction signing via signablePayload() + addSignature()
- Standalone parseTransaction() for all 7 transaction shapes
- Intent-based buildTransaction() with BuildContext for offline building

32 TypeScript tests + Rust unit tests.

BTC-3211

Author: lcovar

package-lock.json

@@ -0,0 +1,10 @@
+target/
+node_modules/
+# we actually only track the .ts files
+dist/
+test/*.js
+test/*.d.ts
+js/*.js
+js/*.d.ts
+js/wasm
+.vscode

packages/wasm-ton/.gitignore

@@ -0,0 +1,5 @@
+{
+  "extensions": ["ts", "tsx", "js", "jsx"],
+  "spec": ["test/**/*.ts"],
+  "node-option": ["import=tsx/esm", "experimental-wasm-modules"]
+}