Bugfix: Implement __str__ for enum props to fix query string

[packyg]

Update both string and int enums to have a __str__ method that return just the string representation of the value:

def__str__(self) ->str:
returnstr(self.value)

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This fixes a bug introduced in #241 (my bad 😬 ). As I noted on that PR, request bodies will be fine as json.dumps will convert the enums correctly. However it does not work for query string params - urllib.parse.urlencode (which httpx uses here)
just does str(val), which returns "EnumClass.key".

So

classSomeEnum(str, Enum):
val="a_value"some_endpoint.sync(client=api_client, some_query_string=SomeEnum.val)

would result in a query string of ?someQueryString=SomeEnum.val instead of ?someQueryString=a_value

[packyg]

CC @dbanty

[codecov]

Codecov Report

Merging #259 (73eed97) into main (4556d9a) will not change coverage.
The diff coverage is n/a.

@@ Coverage Diff @@## main #259 +/- ##
=========================================
Coverage 100.00% 100.00% =========================================
Files 46 46 Lines 1302 1302 =========================================
Hits 1302 1302 

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[packyg]

I wanted to just do return self.value, but mypy couldn't figure out the type

[dbanty]

Thanks for the fix! 🐛