Fix request dump debug log

[k-yomo]

Resolves #258

httputil.DumpRequestOut is actually executing dummy RondTrip and it causes following error since the schema and host is not set at the point.
request dump error: &errors.errorString{s:"unsupported protocol scheme \"\""}

This PR changes the method to use httputil.DumpRequest which can work with an incomplete url.

2023-01-25T01:36:36.976+0900 [DEBUG] provider.terraform-provider-elasticstack: elasticsearch API Request Details:
---[ REQUEST ]---------------------------------------
GET /products?flat_settings=true HTTP/1.1


-----------------------------------------------------: @module=elasticstack tf_mux_provider=*schema.GRPCProviderServer tf_provider_addr=registry.terraform.io/elastic/elasticstack tf_rpc=ApplyResourceChange @caller=/Users/k-yomo/go/src/github.com/k-yomo/terraform-provider-elasticstack/internal/clients/debug.go:46 tf_req_id=6f651534-de0f-0549-41c9-ce9789c53b9f tf_resource_type=elasticstack_elasticsearch_index timestamp=2023-01-25T01:36:36.976+0900

[tobio]

I know this is a super quick fix, but we could simplify the tf provider by using the go-elasticsearch Logger interface.

[tobio]

From the docs

It should only be used by servers to debug client requests

I think that we should be either using the build in go-elasticsearch loggers or if using tflog.* was important implementing a custom logger

[tobio]

@webfella are you able to take a look at my changes here?

[webfella]

LGTM 🥟