[roll] Roll fuchsia [netstack3] Implement partial packet serialization for eBPF
Added and implemented new `PartialSerializer` trait that will be used
for lightweight packet serialization for BPF. It differs from the normal
`Serializer` as follows:
1. Only headers are serialized, not the packet body.
2. Checksum(s) are not calculated.
3. Serialized data is stored in a pre-allocated buffer. This allows
to allocate space for the buffer on the stack.
Original-Bug: 407809292
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1271287
Original-Revision: 2ba39c3a78a6d39135322b971b8023241b0f2e26
GitOrigin-RevId: 5932bab3b08f7076d3d221e59c38854e983d4b44
Change-Id: I0230b2c471ac4e45169eda5a95341d7f6b052115
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