support user-provided timestamp in custom log mode

[jasonren0403]

currently the timestamp in custom log mode(fclog) is provided inner by calling getLocalTime(), but sometimes we should display logs with user-provided timestamps, and currently there is no way to provide the timestamp.

codemirror-editor-vue3/packages/src/components/presetMode/log/utils.ts

Line 141 in 0dfc00e

export function createLog(log: string, type: logErrorTypes) {

[rennzhang]

让我考虑一下如何调整，有好的想法可以互相讨论或者贡献