Annotate Wasm async function return types

[cycraig]

Description of change

Manually annotates Typescript types for the return values of async functions in the Wasm bindings so they are no longer just Promise<Any>.

This affects most of the Client functions:

• publishDocument -> Promise<Receipt>
• publishDiff -> Promise<Receipt>
• publishJSON -> Promise<Receipt>
• resolve -> Promise<Document>
• resolveHistory -> Promise<DocumentHistory>
• resolveDiffHistory -> Promise<DiffChainHistory>

The following functions were left as-is pending the verifiable credential/presentation validation refactor (#312), since those types have not yet been ported properly:

• checkPresentation -> Promise<Any>
• checkCredential -> Promise<Any>

Also changes Array<any> returns for DocumentHistory, IntegrationChainHistory, and DiffChainHistory.

NOTE: the signature of Client.publishDocument has changed:

• publishDocument(any) to publishDocument(Document)

Links to any relevant issues

Partially addresses #309

Type of change

• Bug fix (a non-breaking change which fixes an issue)
• Enhancement (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Fix

How the change has been tested

Local Wasm tests and examples pass locally. Manually inspected the new Receipt type and generated Typescript definitions.

Change checklist

• I have followed the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[PhilippGackstatter]

Looks good to me from the Rust side, did not check the JS side.