Exclude .wasm source files from format check as they are plain c++17 rather than absl + envoy c++17.
Exclude .wasm source files from format check as they are plain c++17
rather than absl + envoy c++17.

Signed-off-by: John Plevyak <21e8c5cc24c747cac934fcbef39d1b757b61996c@gmail.com>

envoyproxy/envoy-wasm,envoyproxy/envoy-wasm,envoyproxy/envoy-wasm,envoyproxy/envoy-wasm,envoyproxy/envoy-wasm,envoyproxy/envoy-wasm,envoyproxy/envoy-wasm