Map a CoT how attribute string (e.g. "m-g") to its CotHow enum value.
how
"m-g"
CotHow
The how attribute from <event how="…">.
<event how="…">
The numeric CotHow enum value, or COTHOW_UNSPECIFIED (0) when the string is unknown.
Map a CoT
howattribute string (e.g."m-g") to itsCotHowenum value.