CORS. Dynamic set access-control-allow-headers from access-control-request-headers

*Title*: *Feature request. Set access-control-allow-headers dynamically from access-control-request-headers with rule*

*Description*:

Now cors filter set response header `access-control-allow-headers` to `allow_headers` value from config. Wildcard not support/work in `access-control-allow-headers` in browser if `access-control-request-headers` set in request. Best practice resolve this problem, set `access-control-allow-headers` to value `access-control-request-headers` if wildcard in config.

Will this implement in envoy? Thanks.