feat: Convert raw bytes or tlsfingerprint record to ClientHelloSpec (#168)

* feat: byte to clienthellospecs conversion

* feat: specific case for GREASE and ALPS

Will automatically add "h2" to ALPS and write to log when GREASE extension is imported in `ImportTLSClientHello()`

* fix: ReadCompressionMethods

ReadCompressionMethods didn't advance the s and fails reading extensions

* fix: remove debug log

* fix: use cryptobyte for internal helper

`helper.Uint8to16()` now calls `(*cryptobyte.String).ReadUint16()`

* fix: preshared key fingerprinter test

updated fingerprinter test to test with PreSharedKey extension

* fix: naming of FakePreSharedKeyExt

It is a Fake extension since `crypto/tls` doesn't really implement PSK-based resumption and neither do we.

* feat: Properly check GREASE

Adopted from #148.

Co-Authored-By: gfw-report <gfw.report@protonmail.com>

* feat: add fakeExtensionEncryptThenMAC

And reordered `fakeExtensionDelegatedCredentials`.

The new `Fingerprinter` is expected to account for the `fakeExtensionEncryptThenMAC` using a `GenericExtension` when `allowBluntMimicry` is set.

Co-Authored-By: gfw-report <gfw.report@protonmail.com>

* fix: remove keepPSK and minor

- Removed all presence of keepPSK flag.
- Added check before using the field of a map.

---------

Co-authored-by: gfw-report <gfw.report@protonmail.com>

handshake_messages.go

@@ -305,7 +305,7 @@ func (m *clientHelloMsg) marshal() ([]byte, error) {
 }
 
 // marshalWithoutBinders returns the ClientHello through the
-// PreSharedKeyExtension.identities field, according to RFC 8446, Section
+// FakePreSharedKeyExtension.identities field, according to RFC 8446, Section
 // 4.2.11.2. Note that m.pskBinders must be set to slices of the correct length.
 func (m *clientHelloMsg) marshalWithoutBinders() ([]byte, error) {
 	bindersLen := 2 // uint16 length prefix