Support external (i.e. user-defined) trace annotations (#195)

* Support external (i.e. user-defined) trace annotations

- tweaked the python examples to be more balanced
- updated the user-api example to conform to user API changes
- moved the get/set for State and ThreadState to state.{hpp,cpp}
- introduced user-provided trace annotations
- added perfetto python category
- moved coverage impl files around
- created enumerations for mapping category enums to category types
- created enumerations for mapping annotation type enums to annotation values
- moved tracing::add_perfetto_annotations to tracing/annotation.hpp
- utility make_index_sequence_range
- libomnitrace-dl: omnitrace_push_category_region
- libomnitrace-dl: omnitrace_pop_category_region
- libomnitrace-user: omnitrace_user_push_annotated_region
- libomnitrace-user: omnitrace_user_pop_annotated_region
- libpyomnitrace: support extra annotations via annotate_trace config value
  - filename
  - line
  - last attempted instr in bytecode (lasti)
  - argcount
  - num local variables
  - stacksize
- omnitrace-python: -a / --annotate-traces option

* tweak ubuntu-focal workflow

* Fix installation of omnitrace-user headers

* ubuntu-focal-codecov workflow update

- Install texinfo

* Update timemory submodule

cmake/Packages.cmake

@@ -49,8 +49,10 @@ set(OMNITRACE_EXTENSION_LIBRARIES
     omnitrace::omnitrace-perfetto)
 
 target_include_directories(
-    omnitrace-headers INTERFACE ${PROJECT_SOURCE_DIR}/source/lib/omnitrace
-                                ${PROJECT_BINARY_DIR}/source/lib/omnitrace)
+    omnitrace-headers
+    INTERFACE ${PROJECT_BINARY_DIR}/source/lib ${PROJECT_BINARY_DIR}/source/lib/omnitrace
+              ${PROJECT_SOURCE_DIR}/source/lib ${PROJECT_SOURCE_DIR}/source/lib/omnitrace
+              ${PROJECT_SOURCE_DIR}/source/lib/omnitrace-user)
 
 # include threading because of rooflines
 target_link_libraries(omnitrace-headers INTERFACE omnitrace::omnitrace-threading)
@@ -372,7 +374,7 @@ else()
             OMNITRACE_DYNINST_API_RT dyninstAPI_RT
             HINTS ${Dyninst_ROOT_DIR} ${Dyninst_DIR}
             PATHS ${Dyninst_ROOT_DIR} ${Dyninst_DIR}
-            PATH_SUFFIXES lib)
+            PATH_SUFFIXES lib NO_CACHE)
 
         if(OMNITRACE_DYNINST_API_RT)
             omnitrace_target_compile_definitions(