MM-21898: Part 2. Add opentracing (#13904)

* initial implementation of opentracing

* app layer

* Revert Makefile

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* cleanup

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* [ci]

* autogenerate interface

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* missed vendor files

* updated interfaces

* updated store layers

* lint fixes

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* finishing layer generators and nested spans

* added errors and b3 support

* code review

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* fixed build error due to misplased flag.Parse()

* code review addressed

model/config.go

@@ -271,6 +271,7 @@ type ServiceSettings struct {
 	EnableLinkPreviews                                *bool
 	EnableTesting                                     *bool   `restricted:"true"`
 	EnableDeveloper                                   *bool   `restricted:"true"`
+	EnableOpenTracing                                 *bool   `restricted:"true"`
 	EnableSecurityFixAlert                            *bool   `restricted:"true"`
 	EnableInsecureOutgoingConnections                 *bool   `restricted:"true"`
 	AllowedUntrustedInternalConnections               *string `restricted:"true"`
@@ -369,6 +370,10 @@ func (s *ServiceSettings) SetDefaults(isUpdate bool) {
 		s.EnableDeveloper = NewBool(false)
 	}
 
+	if s.EnableOpenTracing == nil {
+		s.EnableOpenTracing = NewBool(false)
+	}
+
 	if s.EnableSecurityFixAlert == nil {
 		s.EnableSecurityFixAlert = NewBool(true)
 	}