HTTP2 client client for Firebase
Anthony Gauchy authored
 - Factorize a HTTP2 client out of Apple PNR client
 - Modification of Apple and Firebase client to use this new Http2Client
 - Http2Client now contains a by request timeout handling
 - Adding test for Firebase and Apple push
 - Async tls connection handling for http2 clients
 - Tls timeout tests for http2 client
 - CI Update to include unit test
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