test: run binary-codec tests in the browser (#2566)

- Convert tests to typescript
- Update type definitions causing errors in tests
  - `makeParser` to accept a `Buffer` in addition to `string`
  - `SerializedType` constructor allows not passing in a byte array
  - `Comparable` is now a generic type so that it allows `compareTo`
methods to take more that the type itself. Example: `Uint64.compareTo`
can accept `number`
- Update tests to use jasmine compatible functions
  - Switching from `test` to `it`.
  - Updated test checking if coretypes all implement SerializedType
  - Import fixtures directly instead of using `loadFixture` utility
- Remove importing of `buffer/` explicitly.  It was throwing off type
checking in tests.  Buffer is going away in a future PR anyway.
- Fixed `npm run clean` not clearing `.tsbuildinfo` files for keypairs
- Remove unused account-tx-transactions.db. It was likely used in the
past to test historical ledgers.

packages/ripple-binary-codec/tsconfig.build.json

@@ -0,0 +1,7 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "rootDir": "./src",
+  },
+  "include": ["./src/**/*.ts", "./src/**/*.json"]
+}