Add a new artifact context propagation (#754)

Signed-off-by: Bogdan Drutu <bogdandrutu@gmail.com>

all/build.gradle

@@ -2,6 +2,7 @@ description = "OpenTelemetry All"
 
 def subprojects = [
         project(':opentelemetry-api'),
+        project(':opentelemetry-context-prop'),
         project(':opentelemetry-contrib-runtime-metrics'),
         project(':opentelemetry-contrib-trace-utils'),
         project(':opentelemetry-exporters-inmemory'),
@@ -15,6 +16,7 @@ def subprojects = [
 // A subset of subprojects for which we want to publish javadoc.
 def subprojects_javadoc = [
         project(':opentelemetry-api'),
+        project(':opentelemetry-context-prop'),
         project(':opentelemetry-contrib-runtime-metrics'),
         project(':opentelemetry-contrib-trace-utils'),
         project(':opentelemetry-exporters-inmemory'),

api/build.gradle

@@ -1,7 +1,7 @@
 description = 'OpenTelemetry API'
 
 dependencies {
-    api libraries.grpc_context
+    api project(':opentelemetry-context-prop')
 
     annotationProcessor libraries.auto_value
 

context_prop/build.gradle

@@ -0,0 +1,12 @@
+description = 'OpenTelemetry Context Propagation'
+
+dependencies {
+    api libraries.grpc_context
+
+    signature "org.codehaus.mojo.signature:java17:1.0@signature"
+    signature "net.sf.androidscents.signature:android-api-level-14:4.0_r4@signature"
+}
+
+javadoc {
+    exclude 'io/opentelemetry/internal/**'
+}

settings.gradle

@@ -2,6 +2,7 @@ rootProject.name = "opentelemetry-java"
 
 include ":opentelemetry-all",
         ":opentelemetry-api",
+        ":opentelemetry-context-prop",
         ":opentelemetry-contrib-runtime-metrics",
         ":opentelemetry-contrib-trace-utils",
         ":opentelemetry-exporters-inmemory",
@@ -17,7 +18,7 @@ include ":opentelemetry-all",
 
 project(':opentelemetry-all').projectDir = "$rootDir/all" as File
 project(':opentelemetry-api').projectDir = "$rootDir/api" as File
-project(':opentelemetry-proto').projectDir = "$rootDir/proto" as File
+project(':opentelemetry-context-prop').projectDir = "$rootDir/context_prop" as File
 project(':opentelemetry-contrib-runtime-metrics').projectDir =
         "$rootDir/contrib/runtime_metrics" as File
 project(':opentelemetry-contrib-trace-utils').projectDir =
@@ -32,6 +33,7 @@ project(':opentelemetry-exporters-otprotocol').projectDir =
         "$rootDir/exporters/otprotocol" as File
 project(':opentelemetry-opentracing-shim').projectDir =
         "$rootDir/opentracing_shim" as File
+project(':opentelemetry-proto').projectDir = "$rootDir/proto" as File
 project(':opentelemetry-sdk').projectDir = "$rootDir/sdk" as File
 project(':opentelemetry-sdk-contrib-async-processor').projectDir =
         "$rootDir/sdk_contrib/async_processor" as File