Add inference request cancellation APIs (#249)

* Fix state transitions for re-running requests (#251)

* Add backend/server APIs

* Implement the cancellation APIs

* Only store the state in response factory

* Add unit testing for request cancellation

* Add test

* Add cancellation status

* Add testing for cancelling a request after release

* Handle request re-use

* Enable request reuse test

* Add staged changes

* Add temporary fix for the request state bug

---------

Co-authored-by: Ryan McCormick <rmccormick@nvidia.com>

src/test/CMakeLists.txt

@@ -592,6 +592,14 @@ set_target_properties(
     INSTALL_RPATH ""
 )
 
+target_include_directories(
+  request_cancellation_test
+  PRIVATE
+    ${CMAKE_CURRENT_SOURCE_DIR}/..
+    ${CMAKE_CURRENT_SOURCE_DIR}/../../include
+    ${GTEST_INCLUDE_DIRS}
+)
+
 target_link_libraries(
   request_cancellation_test
   PRIVATE