Better support for the len type about syzkaller HOT 4 CLOSED

3. Many networking protocols expect packet field values to be big-endian. While it's possible to use define KERNEL_CONST_BE htons(KERNEL_CONST) for constants, it's unclear what to do with the length fields.

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2 can be resolved by adding a few special types: bytesize4 to denote the size of a filed in 32-bit words and bytesize8 to denote the size of the field in 64-bit words. The IPv4 example is then can be resolved by using bitfields (#72) and bytesize4[parent] and the IPv6 example - by using bytesize8[parent].

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3 can be resolved by adding a few more types: int16be, int32be and int64be, which will denote an integer of appropriate bit size that should be converted to the big endian byte order (the value should probably be converted while parsing the templates and generating types).

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Bitfields (#72), be suffix and bytesizeN types are now supported.
This can be closed.

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