Expose authoring support in WASM

[duggaraju]

Changes in this pull request

Expose async version of 'embed_from_memory' which can be called from wasm.

Checklist

Since signing methods in the JavaScript land are async need to use AsyncSigner for signing. So created an embed_from_memory_async API combine sign_claim and sign_claim_async into a single function using async_generic macro. Created a WebCryptoSigner type that implements AsyncSigner and used that for the test case.

[mauricefisher64]

I have not forgotten about this PR. We are working through a few PRs before this that have similar changes.

[mauricefisher64]

Can you bring this up to date with main. Thanks. Things are changing fast internally so need to make sure this is still accurate.

[duggaraju]

rebased to latest on the main branch and resolved conflicts.

[duggaraju]

Looks like wasm-tests are failing post rebase. Let me fix those. Not sure the other code coverage related failures.

[duggaraju]

Fix WASM tests and issues after rebasing to latest on main. Fix clippy/fmt issues.

[duggaraju]

@mauricefisher64 can you approve the workflow again.

[duggaraju]

I understood the test failure. The change to AsyncSigner broke the default implementation of SyncSigner. Changed both to be identical now. @mauricefisher64 please review change to signer.rs and timestamp.rs and then you can enable the workflow again.

[duggaraju]

Thanks @gpeacock for approving the changes. Let me know if anything is needed before this can be merged.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 84.54545% with 17 lines in your changes are missing coverage. Please review.

Project coverage is 79.63%. Comparing base (1a2711a) to head (874d8de).

Files	Patch %	Lines
sdk/src/signer.rs	58.33%	10 Missing :warning:
sdk/src/manifest.rs	45.45%	6 Missing :warning:
sdk/src/store.rs	97.14%	1 Missing :warning:

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #369   +/-   ##
=======================================
  Coverage   79.62%   79.63%           
=======================================
  Files          87       87           
  Lines       27276    27277    +1     
=======================================
+ Hits        21719    21722    +3     
+ Misses       5557     5555    -2     

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