Migrate CI to use GitHub Actions.
### Motivation:
To migrate to GitHub actions and centralised infrastructure.
### Modifications:
Changes of note:
* Adopt swift-format using rules from SwiftNIO.
* Remove scripts and docker files which are no longer needed.
* Disabled warnings-as-errors on Swift 6.0 CI pipelines for now.
### Result:
Feature parity with old CI.
Motivation:
In according to RFC 6265 a cookie value may be placed between double quotes.
Modifications:
HTTPClient.Cookie ignores now the double quotes at the beginning and the ending of a cookie value.
New unit test is added to check it.
Result:
Quoted cookie values are parsed properly now.
motivation: the Swift Server Workgroup is not a legal entity and cannot hold copyrights. with this change, code authors continue and retain their copyrights under the apache license and previous copyrights note, but Apple steps up instead of the workgroup which has no legal status
changes:
* update header files to say "Apple Inc. and the AsyncHTTPClient project authors" instead of "Swift Server Workgroup and the AsyncHTTPClient project authors"
* update validation scripts to check for the correct header
* add CONTRIBUTING.md file to explain how to make contributions and include a legal notice about licensing the contribution to Apple and the project
* regenerate CONTRIBUTORS.md to reflect most recent contributions
Rick Newton-RogersandGitHub
KarlandGitHub
Sergei FundaevandGitHub
Artem RedkinandGitHub
Artem RedkinandGitHub
tomer doronandGitHub
vkillandArtem Redkin
