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Support extensions in hello messages (#102)

* Define extention types

* Define construct structs and enums for the Server Name Indication extension

* Update _constructs.Extension to use EnumSwitch

* We probably don't need to define the type field

* WIP: Use TLSPrefixedArray instead of Bytes + get rid of buffering of extension bytes while parsing

* Update use of TLSPrefixedArray, since we changed the api

* Update CertificateRequest to expect a TLSPrefixedArray for
supported_signature_algorithms. This means that we will now rely on
construct to parse this list for us, instead of doing it ourselves.

* Updating ClientHello construct to use TLSPrefixedArray

* Update ServerHello construct to parse extensions

* The minimum size of SupportedSignatureAlgorithms is 1

* Update test_hello_message with real extension values

* Removing ServerNameList constructs for now, will implement in a separate PR

* pep8

* Wrap each SignatureAndHashAlgorithm object in a Container. Make extension bytes more readable in test data

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