Update Cmake build files to reflect recent dependency change (#2705)

NOTE(@mrry): This is a partial fix to the build files, which will be followed up in #2839.

* WIP: update cmake files to fix build issues

* Add cmake file for external dependency jsoncpp

* Update cmake files to add boringssl dependency

* Add cmake file for proto_text tool

* Update cmake files to generate proto text files

* Add farmhash dependency

* Add highwayhash dependency