Moving TransferState out of http folder

[saiHemak]

TransferState has 1-on-1 relationship with EasyHandle and is independent of protocol.Hence it has been moved out of the http folder.In the next PR, this code will be aligned under NativeProtocol instead of HTTPURLprotocol which can be used across different protocols.

@alblue , I understand that this PR alone will not make much sense as the code is still an extension of HTTPURLProtocol.To address #1355 ,I have raised PR for the movement of the file.The code under this PR will be renamed to _NativeProtocol in the next PR.

[pushkarnk]

This is just a file movement intended for work coming up in a future PR.

@swift-ci please test and merge

[alblue]

@swift-ci please test and merge

[pushkarnk]

@swift-ci please test and merge

[pushkarnk]

Build failure again. Looks like a CI problem.
@shahmishal We've been seeing this merger issue since yesterday. Can you please help us out? Thank you.

ERROR: Step ‘Github Pull Request Merger’ aborted due to exception: 
java.io.IOException: Server returned HTTP response code: 405 for URL: https://api.github.com/repos/apple/swift-corelibs-foundation/pulls/1369/merge
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1876)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1474)
	at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480)
	at sun.net.www.protocol.https.HttpsURLConnectionImpl.getResponseCode(HttpsURLConnectionImpl.java:338)
	at org.kohsuke.github.Requester.parse(Requester.java:602)
Caused: java.io.IOException: Server returned HTTP response code: 405 for URL: https://api.github.com/repos/apple/swift-corelibs-foundation/pulls/1369/merge
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at sun.net.www.protocol.http.HttpURLConnection$10.run(HttpURLConnection.java:1926)
	at sun.net.www.protocol.http.HttpURLConnection$10.run(HttpURLConnection.java:1921)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.net.www.protocol.http.HttpURLConnection.getChainedException(HttpURLConnection.java:1920)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1490)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1474)
	at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:254)
	at org.kohsuke.github.Requester.parse(Requester.java:612)

[shahmishal]

@pushkarnk Looking into it.

[shahmishal]

@swift-ci please test and merge

[shahmishal]

@pushkarnk It should be fixed now

[pushkarnk]

Thanks @shahmishal ! I appreciate the prompt response :)

[saiHemak]

Thank you @shahmishal