Add a multifunctional `Dialer` struct and reimplement the function API
Reimplement the existing function interfaces of the fasthttpproxy package through Dialer. Refactor Dialer.GetDialFunc to ensure that its performance is comparable to the original function interfaces when the proxy does not change with the request address.
* Update Go Version to Go1.19.x And add cache
* Fix CI Line endings
* Update test CI Go Version to Go1.19.x And add cache
* Update Gosec Security Scanner CI to securego/gosec@v2.12.0
* Format comment
Go 1.19 adds support for links, lists, and clearer headings in doc comments. As part of this change, gofmt now reformats doc comments to make their rendered meaning clearer. See “Go Doc Comments” for syntax details and descriptions of common mistakes now highlighted by gofmt. As another part of this change, the new package go/doc/comment provides parsing and reformatting of doc comments as well as support for rendering them to HTML, Markdown, and text.
ref: https://tip.golang.org/doc/go1.19
ref: https://tip.golang.org/doc/comment
* Fix doc structure
* Run go test on github actions
travis-ci.org has stopped.
See also: https://github.com/curl/curl/issues/7150
Downside: github actions don't support ppc64le
* Run less
* delete .travis.yml
* Remove travis + minor lint fixes