Change default log file permissions

[jtpalmer]

Description

Change the default file and directory permissions for log files created by the CCR\Log class. Also updates the class constructor to allow these permissions to be changed.

Note that log files created directly by the Log class are not changed.

Motivation and Context

https://app.asana.com/0/342819846538629/1178746552707810/f

Tests performed

Tested manually.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project as found in the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.