feat(bindings-ts): support multi-auth workflows

- add `atomic_swap` and `token` contracts from
  https://github.com/stellar/soroban-examples to `test-wasms`
- switch from `ts-tests/package.json` to an `initialize.sh` script that
  uses a `.env` if available or defaults to environment variables. As
  before, this will build, deploy, and generate bindings for the new
  contracts, plus creating an `alice` identity and minting separate
  amounts of two separate tokens to the `root` user and `alice`
- add tests for atomic swap functionality inspired by
  https://github.com/stellar/soroban-react-atomic-swap
- let this logic guide needed updates to `bindings typescript`-generated
  libraries:
  - don't return flat values
  - instead, return a `new AssembledTransaction`, a class that has a
    `result` getter that can be used to get the result of the simulation
    right away, or can be used to `await tx.sign()` then `await
    tx.send()`.
  - `AssembledTransaction` also contains all possibly-relevant fields
    from the logic it performs, such as `sendTransactionAll` (these
    field names are a bit raw right now, and could probably be renamed
    to be more clear to new users)
  - `AssembledTransaction` also has a `nonInvokerAuthEntries()` getter
    and a `signAuthEntriesFor(publicKey, signingFunction)` to facilitate
    multi-auth workflows.

Co-authored-by: Aristides Staffieri <aristides.staffieri@stellar.org>

Cargo.toml

@@ -47,6 +47,11 @@ version = "20.0.0-rc2"
 git = "https://github.com/stellar/rs-soroban-sdk"
 rev = "0992413f9b05e5bfb1f872bce99e89d9129b2e61"
 
+[workspace.dependencies.soroban-token-sdk]
+version = "20.0.0-rc2"
+git = "https://github.com/stellar/rs-soroban-sdk"
+rev = "0992413f9b05e5bfb1f872bce99e89d9129b2e61"
+
 [workspace.dependencies.soroban-ledger-snapshot]
 version = "20.0.0-rc2"
 git = "https://github.com/stellar/rs-soroban-sdk"