fix(async): Correct async HTTP method handling in Datasource.smartquery()

[JIAQIA]

Description:
This PR fixes a TypeError in the async smartquery() method where HTTP method references (POST/GET) were incorrectly being awaited during assignment rather than during execution.

Changes:

1. Removed incorrect await when assigning self.client.POST/GET method references
2. Added proper await when actually making the request
3. Applied same correction to the special case handling for Elasticsearch/Testdata

Impact:
• Fixes broken POST request functionality in async datasource queries

• Maintains consistent async behavior throughout the method

• Follows proper async/await patterns for HTTP requests

Testing:
Manual verification was performed by:

1. Executing POST queries against test datasources
2. Verifying both direct queries and expression-based queries
3. Checking special case handling paths

Related Issues:
#223

Checklist:
Code follows the project's style guidelines

Tests pass (or N/A - this bug wasn't caught by existing tests)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.94%. Comparing base (7acc4d8) to head (dad78c2).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #224      +/-   ##
==========================================
- Coverage   92.40%   89.94%   -2.47%     
==========================================
  Files          27       27              
  Lines        1818     1810       -8     
==========================================
- Hits         1680     1628      -52     
- Misses        138      182      +44     

Flag	Coverage Δ
unittests	89.94% <ø> (-2.47%)	⬇️

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[amotl]

Hi. Thanks for your patch. Maybe this is something to consider for the async code generator instead?

/cc @Ousret

[JIAQIA]

Perhaps, but the current code is indeed not working properly. I'm using the smartquery interface, so fixing this issue would be really helpful for me. Otherwise, I'd have to use synchronous methods for this interface, which would be quite cumbersome.

[amotl]

We hear you. The thing is that the async code is getting generated, so I think we need to fix the generator instead. Maybe you can also make a difference there? generate_async.py it is.

[amotl]

I have to admit I am looking at the very ingredients of generate_async.py for the first time in my life. Apperently, it is not a generic translator, but tailored to the codebase instead.

I think the culprit is around this spot at line 104.

grafana-client/script/generate_async.py

Lines 102 to 110 in 6aa9701

	module_dump = re.sub(r"( {4}def )(?!_)", r" async def ", module_dump)
	module_dump = module_dump.replace("self.client.", "await self.client.")
	for relative_import in [".base", "..client", "..knowledge", "..model"]:
	module_dump = module_dump.replace(f"from {relative_import}", f"from .{relative_import}")
	module_dump = module_dump.replace("self.api.version", "await self.api.version")
	module_dump = module_dump.replace("= self.", "= await self.")

[amotl]

Hi again. I've just added the fix for the code converter to complete the job. Thanks again!

[Ousret]

Great catch! I maybe available soon to implement unasync and mirror all the tests also.