feat: exporting types (#30)

## fixes  N/A

Exporting different Types

## How to test:
Please provide a brief step-by-step instruction.
If necessary provide information about dependencies (specific
configuration, branches, database dumps, etc.)

- Step 1
- Step 2
- etc.

## Checklist:

- [ ] I have verified that the code works
- [ ] I have verified that the code is easy to understand
  - [ ] If not, I have left a well-balanced amount of inline comments
- [ ] I have [left the code in a better
state](https://deviq.com/principles/boy-scout-rule)
- [ ] I have documented the changes (where applicable)
* Either PR or Ticket to update [the
Docs](https://github.com/KILTprotocol/docs)
    * Link the PR/Ticket here

src/index.ts

@@ -6,3 +6,4 @@
  */
 
 export { getExtensions, watchExtensions, initializeKiltExtensionAPI } from './getExtension/index.js'
+export { InjectedWindowProvider, IEncryptedMessageV1, PubSubSessionV1, PubSubSessionV2, ApiWindow } from './types'