C API integration layer

This MR includes the C API layer for starting/stopping the gRPC server.

cpp/docs/doxygen.config

@@ -792,6 +792,7 @@ WARN_LOGFILE           =
 # Note: If this tag is empty the current directory is searched.
 
 INPUT                  = src
+INPUT                 += include
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding. Doxygen uses
@@ -816,8 +817,8 @@ INPUT_ENCODING         = UTF-8
 # *.m, *.markdown, *.md, *.mm, *.dox, *.py, *.pyw, *.f90, *.f95, *.f03, *.f08,
 # *.f, *.for, *.tcl, *.vhd, *.vhdl, *.ucf and *.qsf.
 
+                         # *.cc \
 FILE_PATTERNS          = *.c \
-                         *.cc \
                          *.cxx \
                          *.cpp \
                          *.c++ \