Change log for BEYONDTRUST_REMOTE_ACCESS

Date Changes
2022-09-30 Enhancement -
- Wrote grok to parse unparse syslogs".
- Mapped "device_vendor" to "additional.fields".
- Mapped "event_name" to "additional.fields".
- Mapped "device_product" to "additional.fields".
- Mapped "externalKeyLabel" to "additional.fields".
- Mapped "dstPriv" to "additional.fields".
- Mapped "filePath" to "target.file.full_path".
- Mapped "fsize" to "target.file.size".
2022-07-14 Newly created parser