[Exporter] Allow to match resource names by regular expression

Changes

In addition to the existing -match option, this PR allows the matching of names by regex during the listing operation. There are new options:

-matchRegex - checks if name matches a regex - this could be useful for exporting notebooks for only specific users, or something like that.
-excludeRegex - checks if name matches a regex, and skips processing of that object. For example, it could be used to exclude databricks_automl directories. This parameter has higher priority than the -match and -matchRegex.
filterDirectoriesDuringWorkspaceWalking - if we should apply match logic to directory names when we're performing workspace tree walking. Note: be careful with it as it will be applied to all entries, so if you want to filter only specific users, then you will need to specify the condition for /Users as well, so regex will be `^(/Users|/Users/[a-c].)$`*