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/test/pseudo-transaction.test.ts

@@ -0,0 +1,38 @@
+import { encode, decode } from '../src'
+
+let json = {
+  Account: 'rrrrrrrrrrrrrrrrrrrrrhoLvTp',
+  Sequence: 0,
+  Fee: '0',
+  SigningPubKey: '',
+  Signature: '',
+}
+
+let json_blank_acct = {
+  Account: '',
+  Sequence: 0,
+  Fee: '0',
+  SigningPubKey: '',
+  Signature: '',
+}
+
+let binary =
+  '24000000006840000000000000007300760081140000000000000000000000000000000000000000'
+
+describe('Can encode Pseudo Transactions', () => {
+  it('Correctly encodes Pseudo Transaciton', () => {
+    expect(encode(json)).toEqual(binary)
+  })
+
+  it('Can decode account objects', () => {
+    expect(decode(encode(json))).toEqual(json)
+  })
+
+  it('Blank AccountID is ACCOUNT_ZERO', () => {
+    expect(encode(json_blank_acct)).toEqual(binary)
+  })
+
+  it('Decodes Blank AccountID', () => {
+    expect(decode(encode(json_blank_acct))).toEqual(json)
+  })
+})