Feature flag to use WinInet client not WinHttp

[poodlewars]

This shows how to use WinInet client rather than WinHttp.

This gives better error messages in the AWS SDK logs for cert errors:

[DEBUG] 2024-01-31 11:02:44.560 WinInetSyncHttpClient [28240] amz-sdk-invocation-id: 15325992-86D2-49FF-B122-11A6CC210E4F

amz-sdk-request: attempt=1

authorization: AWS4-HMAC-SHA256 Credential=6pWBXggusk9MPFTpvj5G/20240131/us-east-1/s3/aws4_request, SignedHeaders=amz-sdk-invocation-id;amz-sdk-request;content-type;host;x-amz-api-version;x-amz-content-sha256;x-amz-date, Signature=5873b05fa185391c2d1b65ab337296164b313c979f26c00cde0640381cc46eac

content-type: application/xml

host: localhost:9000

user-agent: aws-sdk-cpp/1.11.201 ua/2.0 md/aws-crt#0.24.7 os/Windows#10.0.22621.2506 md/arch#AMD64 lang/c++#C++199711L md/MSVC#1937 cfg/retry-mode#default api/S3

x-amz-api-version: 2006-03-01

x-amz-content-sha256: UNSIGNED-PAYLOAD

x-amz-date: 20240131T110244Z


[WARN] 2024-01-31 11:02:44.579 WinInetSyncHttpClient [28240] Send request failed: The certificate authority is invalid or incorrect

Compared to WinHttp, which just says,

A security error occurred.

However, we can't merge this without a feature flag because the SSL verification disablement doesn't seem to work with this client, the AWS SDK logs:

[WARN] 2024-01-31 11:02:42.684 WinInetSyncHttpClient [28240] Turning ssl unknown ca verification off.
[FATAL] 2024-01-31 11:02:42.684 WinInetSyncHttpClient [28240] Failed to turn ssl cert ca verification off.

I've tested that this change does not affect Linux, even when the feature flag is set.

[DrNickClarke]

LGTM