chore(client/context): add readOnly field (#474)

resource/interface/client/context.lua

@@ -13,6 +13,7 @@ local openContextMenu = nil
 ---@field description? string
 ---@field metadata? string | { [string]: any } | string[]
 ---@field disabled? boolean
+---@field readOnly? boolean
 ---@field event? string
 ---@field serverEvent? string
 ---@field args? any