Aomenc stat fields

fields.json

# Fields meanings: <source root>/av1/encoder/firstpass.h
fields = [
    "frame",
    "weight",
    "intra_error",
    "frame_avg_wavelet_energy",
    "coded_error",
    "sr_coded_error",
    "tr_coded_error",
    "pcnt_inter",
    "pcnt_motion",
    "pcnt_second_ref",
    "pcnt_third_ref",
    "pcnt_neutral",
    "intra_skip_pct",
    "inactive_zone_rows",
    "inactive_zone_cols",
    "MVr",
    "mvr_abs",
    "MVc",
    "mvc_abs",
    "MVrv",
    "MVcv",
    "mv_in_out_count",
    "new_mv_count",
    "duration",
    "count",
    "raw_error_stdev",
    "is_flash",
    "noise_var",
    "cor_coeff",
]