Better naming for Padding and GREASE QUIC Transport Parameters

The naming for

Lines 64 to 68 in 835e073

    
           type GREASE struct { 
        
           	IdOverride    uint64 // if set to a valid GREASE ID, use this instead of randomly generated one. 
        
           	Length        uint16 // if len(ValueOverride) == 0, will generate random data of this size. 
        
           	ValueOverride []byte // if len(ValueOverride) > 0, use this instead of random bytes. 
        
           }

and

utls/u_quic_transport_parameters.go

Line 274 in 835e073

type Padding []byte

are ambiguous and not comprehensive enough. Possibly we should rename it to PaddingTransportParameter and GREASETransportParameter.

	type GREASE struct {
	IdOverride uint64 // if set to a valid GREASE ID, use this instead of randomly generated one.
	Length uint16 // if len(ValueOverride) == 0, will generate random data of this size.
	ValueOverride []byte // if len(ValueOverride) > 0, use this instead of random bytes.
	}