Job Activity Log via RESTful API

#### Feature Request Description
We have an integration with MHPC that uses MPHC's RESTful API to communicate with MHPC. Currently there is no way to retrieve the job activity logs via this API.

#### Describe Preferred Solution
A new RESTful endpoint which retrieves the job activity logs. For example, this might be: GET https://head_node_name:port/WindowsHPC/Job/job_identifier/ActivityLog

#### Describe Alternatives Considered
The job activity log is currently available through:
- PowerShell script
- Command line
- Direct database query

However, these all require a Windows Domain attached client with the HPC tools installed and do not work well in our environment.

#### Additional Context
n/a