added 'module_name' to podspecs (#618)

Author: bryce-b

OpenTelemetry-Swift-Api.podspec

@@ -15,7 +15,7 @@ Pod::Spec.new do |spec|
   spec.ios.deployment_target = "13.0"
   spec.tvos.deployment_target = "13.0"
   spec.watchos.deployment_target = "6.0"
-
+  spec.module_name = "OpenTelemetryApi"
   # This is necessary because we use the `package` keyword to access some properties in `OpenTelemetryApi`
   # This keyword was introduced in Swift 5.9 and it's tightly bound to SPM.
   # To provide the correct values to the flags `-package-name` and `-module-name` we checked out the outputs from:

OpenTelemetry-Swift-Sdk.podspec

@@ -15,6 +15,6 @@ Pod::Spec.new do |spec|
   spec.ios.deployment_target = "13.0"
   spec.tvos.deployment_target = "13.0"
   spec.watchos.deployment_target = "6.0"
-
+  spec.module_name = "OpenTelemetrySdk"
   spec.dependency 'OpenTelemetry-Swift-Api', spec.version.to_s
 end