Upgrade Extension and HandshakeMessage types to QD parsers

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In preparation of the new HandshakeLog interface, we should finish porting the types of message contents to the QD-generated ones.

• Split the extension into separate types for CH, SH, EE, CR, C, NST. Remove ext_msg index.
• Remove sum types from the leaf types (psk, protocol_version, keyShare, etc)
• Upgrade psk to PreSharedKeyClientExtension/PreSharedKeyServerExtension
• Upgrade protocol_version to SupportedVersions/ProtocolVersion
• Upgrade list serverName to ServerNameList/OneServerName
• Upgrade keyShare to KeyShareClientHello/KeyShareEntry
• Upgrade earlyDataIndication
• Upgrade list point_format to ECPointFormatList
• Upgrade list CommonDH.namedGroup to NamedGroupList
• Upgrade signatureSchemeList to SignatureSchemeList

Once this is done, we can update the internal extension parsers in HandshakeMessage to the generated ones. The next step is to upgrade HandshakeMessage itself:

• Split handshakeType into handshakeType, handshakeType12, handshakeType13 and hs_msg into handshakeMessage, handshakeMessage12, handshakeMessage13
• Split the Handshake.recv_fragment state machine more cleanly to operate on separate message types
• Upgrade ClientHello, ServerHello, and HelloRetryRequest
• Upgrade TLS 1.3 messages
• Upgrade TLS <1.3 messages

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The first part is complete in adl_extensions