wgengine/filter: add filter benchmark

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Baseline, on 2020 M1 Macbook Pro, on power:

    goos: darwin
    goarch: arm64
    pkg: tailscale.com/wgengine/filter
    BenchmarkFilterMatch/file1-8    34089133                32.79 ns/op
    BenchmarkFilterMatch/file1-8    35423917                32.59 ns/op
    BenchmarkFilterMatch/file1-8    35208598                32.80 ns/op
    BenchmarkFilterMatch/file1-8    35180470                33.39 ns/op
    BenchmarkFilterMatch/file1-8    36671608                32.82 ns/op
    BenchmarkFilterMatch/file1-8    35435991                33.13 ns/op
    BenchmarkFilterMatch/file1-8    34689181                33.29 ns/op
    BenchmarkFilterMatch/file1-8    34786053                32.94 ns/op
    BenchmarkFilterMatch/file1-8    35366235                32.56 ns/op
    BenchmarkFilterMatch/file1-8    35342799                32.47 ns/op

Updates #12486

Change-Id: I8f902bc064effb431e5b46751115942104ff6531
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

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