Async await support

[volodymyrZotov]

Resolves #58

This PR adds the ability to use the client library in async way.

To initialize an async client you can pass is_async: bool flag to new_client(url: str, token: str, is_async: bool = False) function.

async def main():
    async_client = new_client(CONNECT_HOST, CONNECT_TOKEN, True)
    item = await async_client.get_item_by_title("Test", "dslxntic63k5spe34o556n4hio") # retrieve item asynchronously 
    print(item)
    await async_client.session.aclose() # close the client gracefully when you are done

asyncio.run(main())

By default, NON-async client is initialized.

[codecov-commenter]

Codecov Report

Patch coverage: 83.30% and project coverage change: +2.58% 🎉

Comparison is base (56a6f3e) 74.38% compared to head (feeeb87) 76.97%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #62      +/-   ##
==========================================
+ Coverage   74.38%   76.97%   +2.58%     
==========================================
  Files          22       28       +6     
  Lines        1667     1928     +261     
==========================================
+ Hits         1240     1484     +244     
- Misses        427      444      +17     

Files Changed	Coverage Δ
src/onepasswordconnectsdk/async_client.py	65.35% <65.35%> (ø)
src/onepasswordconnectsdk/serializer.py	67.74% <67.74%> (ø)
src/onepasswordconnectsdk/client.py	63.37% <77.19%> (-3.79%)	⬇️
src/onepasswordconnectsdk/utils.py	90.90% <90.90%> (ø)
src/onepasswordconnectsdk/connect.py	93.75% <93.75%> (ø)
src/onepasswordconnectsdk/errors.py	100.00% <100.00%> (ø)
src/tests/test_client_items.py	100.00% <100.00%> (ø)
src/tests/test_client_vaults.py	100.00% <100.00%> (ø)
src/tests/test_config.py	100.00% <100.00%> (ø)
src/tests/test_connect.py	100.00% <100.00%> (ø)

... and 5 files with indirect coverage changes

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[jillianwilson]

Looks good overall but can you update the readme with info about using async

[edif2008]

Great job on working on this complex task. So far it looks solid.

I will say that it's a bit tricky to easily compare the two clients and see the key differences in the current state.

With that, I have a couple of comments / questions:

• Is it possible to do a benchmark and see if the async client if faster than the normal one? Asking to see if it does a significant advantage to the user.
• Would it be better to split the async and sync client into separate files? I feel like it would help readability (for this review at least) and maintainability. Same goes for splitting the tests for async and sync clients.

[edif2008]

Functional review: ➖

Not needed since the main part of this PR is to 'duplicate' the functionality for an async client. By checking the diffs between the two clients, I can confirm that they have the same functionality. Therefore, folks who will use the async client only need to tweak the code related to getting the async client. The rest will remain the same.

Also, the tests made for the async client should give us the confidence that the async client works as expected.

Code review: ✅

This looks good to be merged.
I've left some nitpick comments that shouldn't block this from being merged.