Move the logs-sdk and metrics-sdk requires

This makes it so the logs and metrics will work when you require like
```ruby
require 'opentelemetry/sdk/logs'
require 'opentelemetry/sdk/metrics'
```
Without getting 'opentelemetry-logs-api' or 'opentelemetry-logs-metrics'
earlier.

The opentelemetry-exporter-otlp-logs gem works around this, but I'm
leaving that workaround there for now, so it will work with old versions
of the opentelemetry-logs-sdk gem that are still locked.

[Fixes #1955]

Author: BrianHawley

logs_sdk/lib/opentelemetry-logs-sdk.rb

@@ -4,6 +4,4 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 
-require 'opentelemetry/sdk'
-require 'opentelemetry-logs-api'
 require 'opentelemetry/sdk/logs'

logs_sdk/lib/opentelemetry/sdk/logs.rb

@@ -4,6 +4,9 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 
+require 'opentelemetry/sdk'
+require 'opentelemetry-logs-api'
+
 require_relative 'logs/version'
 require_relative 'logs/configurator_patch'
 require_relative 'logs/logger'

metrics_sdk/lib/opentelemetry-metrics-sdk.rb

@@ -4,6 +4,4 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 
-require 'opentelemetry/sdk'
-require 'opentelemetry-metrics-api'
 require 'opentelemetry/sdk/metrics'

metrics_sdk/lib/opentelemetry/sdk/metrics.rb

@@ -4,6 +4,9 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 
+require 'opentelemetry/sdk'
+require 'opentelemetry-metrics-api'
+
 module OpenTelemetry
   module SDK
     # The Metrics module contains the OpenTelemetry metrics reference