HTTP Stream Telemetry API

What's Changed

• add github templates and bots by @jmklix in #436
• update builder version to fix aws-lc build on manylinux1 by @TingDaoK in #437
• Fix compiler warnings about missing void by @graebm in #438
• HTTP stream telemetry api by @TingDaoK in #433
• Fix warnings in public headers by @waahm7 in #440

Full Changelog: v0.7.7...v0.7.8