BMP Stats Report non-counter/non-gauge types not fully supported

[digizeph]

Specifically, based on RFC7854 Stats Report type 9 and 10 are not 4-byte counter or 8-byte gauge, and we currently assume all values needs to be 4 or 8 bytes and thus causing false corrupted-message errors.

More in RFC8671 type 16 and 17.

Code snippets that needs revision:

bgpkit-parser/src/parser/bmp/messages/stats_report.rs

Lines 49 to 52 in af03064

	pub enum StatsData {
	Counter(u32),
	Gauge(u64),
	}

bgpkit-parser/src/parser/bmp/messages/stats_report.rs

Lines 60 to 63 in af03064

	let stat_data = match stat_len {
	4 => StatsData::Counter(data.read_u32()?),
	8 => StatsData::Gauge(data.read_u64()?),
	_ => return Err(ParserBmpError::CorruptedBmpMessage),

[linear]

BGP-105 BMP Stats Report non-counter/non-gauge types not fully supported