Taishi Ikai

Add WebP advanced options

4

Added more WebP convert options below. https://github.com/webmproject/libwebp/blob/main/src/enc/config_enc.c

Support Swift Package Manager

5

This PR take over https://github.com/RxSwiftCommunity/RxWebKit/pull/37.

Add FastAPI extension

4

closes https://github.com/census-instrumentation/opencensus-python/issues/1020 This PR adds the [FastAPI](https://fastapi.tiangolo.com/) extension into `contrib` dir. Just like the stackdriver extension, it targets py3.6 and above that FastAPI supports.