Remove circular imports from types (#492)

* Remove circular imports from types

- These are creating issues on RN and is not correct
- Uint is equivalent to BN (extends it), so remove it.
- Don't import all classes (it imports types itself) - CodecTypes can be exposed elsewhere if needed

* Cleanup linting & imports

* Cleanup compact decoding

packages/type-jsonrpc/src/create/param.ts

@@ -2,7 +2,7 @@
 // This software may be modified and distributed under the terms
 // of the Apache-2.0 license. See the LICENSE file for details.
 
-import { CodecTypes } from '@polkadot/types/types';
+import { CodecTypes } from '@polkadot/types/classes';
 import { RpcParam } from '../types';
 
 type RpcParamOptions = {

packages/type-jsonrpc/src/types.ts

@@ -2,7 +2,7 @@
 // This software may be modified and distributed under the terms
 // of the Apache-2.0 license. See the LICENSE file for details.
 
-import { CodecTypes } from '@polkadot/types/types';
+import { CodecTypes } from '@polkadot/types/classes';
 
 export type RpcParam = {
   isOptional: boolean,