wgengine/filter: add TCP non-SYN benchmarks

To show performance during heavy flows on established connections.

    BenchmarkFilterMatch/tcp-not-syn-v4-8           52125848                21.46 ns/op
    BenchmarkFilterMatch/tcp-not-syn-v4-8           52388781                21.43 ns/op
    BenchmarkFilterMatch/tcp-not-syn-v4-8           52916954                21.32 ns/op
    BenchmarkFilterMatch/tcp-not-syn-v4-8           52590730                21.43 ns/op
    BenchmarkFilterMatch/tcp-not-syn-v4-8           53015923                21.32 ns/op
    BenchmarkFilterMatch/tcp-not-syn-v4-no-logs-8   122795029                9.783 ns/op
    BenchmarkFilterMatch/tcp-not-syn-v4-no-logs-8   100000000               10.09 ns/op
    BenchmarkFilterMatch/tcp-not-syn-v4-no-logs-8   120090948                9.747 ns/op
    BenchmarkFilterMatch/tcp-not-syn-v4-no-logs-8   122350448               10.55 ns/op
    BenchmarkFilterMatch/tcp-not-syn-v4-no-logs-8   122943025                9.813 ns/op

Updates #12486

Change-Id: I8e7c9380bf969ad646851d53f8a4c287717694ea
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
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