Log AWS SDK warnings and API requests at cert-manager debug level

[wallrj]

Allows you to see which API endpoints are being used and which region is being used in the request signature.
To help debug AWS Route53 problems in the field.

Here's how it looks at -v 4 with JSON logging enabled and using jl to parse the logs:

[2024-09-20 14:31:37] preparing to create Route53 provider [caller=dns/dns.go:296 dnsName=75b2296e-65a9-4c25-954b-d0b283c6bfd2.com domain=75b2296e-65a9-4c25-954b-d0b283c6bfd2.com logger=cert-manager.controller.Present.solverForChallenge resource_kind=Challenge resource_name=www-1-2762490819-1292702510 resource_namespace=default resource_version=v1 type=DNS-01]
[2024-09-20 14:31:37] using ambient credentials [caller=route53/route53.go:99 logger=cert-manager.route53-session-provider]
[2024-09-20 14:31:37] presenting DNS01 challenge for domain [caller=dns/dns.go:104 dnsName=75b2296e-65a9-4c25-954b-d0b283c6bfd2.com domain=75b2296e-65a9-4c25-954b-d0b283c6bfd2.com logger=cert-manager.controller.Present resource_kind=Challenge resource_name=www-1-2762490819-1292702510 resource_namespace=default resource_version=v1 type=DNS-01]
[2024-09-20 14:31:37] Request
POST / HTTP/1.1
Host: sts.us-west-2.amazonaws.com
User-Agent: aws-sdk-go-v2/1.30.4 os/linux lang/go#1.22.3 md/GOOS#linux md/GOARCH#amd64 api/sts#1.30.4
Content-Length: 1341
Amz-Sdk-Invocation-Id: fb64a1a5-aec3-47aa-9415-383cd8f1fc32
Amz-Sdk-Request: attempt=1; max=3
Content-Type: application/x-www-form-urlencoded
Accept-Encoding: gzip

 [aws-classification=DEBUG caller=route53/route53.go:90 dnsName=75b2296e-65a9-4c25-954b-d0b283c6bfd2.com domain=75b2296e-65a9-4c25-954b-d0b283c6bfd2.com logger=cert-manager.controller.Present resource_kind=Challenge resource_name=www-1-2762490819-1292702510 resource_namespace=default resource_version=v1 type=DNS-01]

ℹ️ Notice that the user-agent header in requests to STS does not contain the cert-manager info.

User-Agent: aws-sdk-go-v2/1.30.4 os/linux lang/go#1.22.3 md/GOOS#linux md/GOARCH#amd64 api/sts#1.30.4

That's because we currently add the user-agent after loading the config, and before instantiating Route53 client.
I'll fix that in a followup PR.

/kind feature

Feature: Log AWS SDK warnings and API requests at cert-manager debug level to help debug AWS Route53 problems in the field.

[wallrj]

Read about AWS SDK ClientLogMode here:

• https://aws.github.io/aws-sdk-go-v2/docs/configuring-sdk/logging/#clientlogmode

[inteon]

/approve
/lgtm

[cert-manager-prow]

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