Change log for SHAREPOINT

Date Changes
2025-03-15 Newly created parser.
Mapped the following fields:
- `database` to `principal.process.file.names`
- `SamAccountName` to `principal.hostname` and `principal.asset.hostname`
- `UserName` to `principal.user.user_display_name`
- `UserEmail` to `principal.user.email_addresses`
- `ItemType` to `target.resource.type`
- `EventType` to `security_result.description`
- `Directory` to `target.file.full_path`
- `Leaf` to `target.file.names`
- `EventData` to `metadata.product_version`
- `Created` to `principal.asset.attribute.labels`
- `LastModified` to `principal.asset.attribute.labels`
- `SecGroupName` to `target.user.group_identifiers`
- `SecSamAccountName` to `target.user.userid`
- `SecUserName` to `target.user.user_display_name`
- `SecUserEmail` to `target.user.email_addresses`
- `SecUserRole` to `target.user.attribute.roles`
- `SecUserURL` to `target.url`
- `SourceModuleName` to `metadata.product_version`
- `SourceModuleType` to `metadata.product_event_type`
- `SHAREPOINT` to `metadata.vendor_name` and `metadata.product_name`