enable request logging when debug is enabled

Previously, enabling debug for the tf provider did not log out requests.
The cloud sdk already supported a debug mode. We now enable this via
configuration if one of the terraform debug env vars (TF_LOG_PROVIDER or
TF_LOG) are set to either "DEBUG" or "TRACE".

CHANGELOG.md

@@ -7,6 +7,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## Added
+
+- Allow the logging of requests to the cloud SDK by setting either TF_LOG or
+  TF_LOG_PROVIDER envvars to either DEBUG or TRACE.
+
 ## [1.3.1] - 2023-12-01
 
 ### Fixed

internal/provider/provider.go

@@ -89,6 +89,16 @@ func (p *provider) Configure(
 	}
 	cfg.UserAgent = UserAgent
 
+	logLevel := os.Getenv("TF_LOG")
+	if logLevel == "DEBUG" || logLevel == "TRACE" {
+		cfg.Debug = true
+	} else {
+		logLevel = os.Getenv("TF_LOG_PROVIDER")
+		if logLevel == "DEBUG" || logLevel == "TRACE" {
+			cfg.Debug = true
+		}
+	}
+
 	// retryablehttp gives us automatic retries with exponential backoff.
 	httpClient := retryablehttp.NewClient()
 	// The TF framework will pick up the default global logger.