Add heap stats logging to Service

[harrider]

Description

It would be useful to gain insight into memory usage in helping to debug runtime issues.

Work Done

• Added the v8 npm package to gather heap usage statistics
• Added conditional logging to log these heap usage stats
• Added 2 environment variables to control heap stats logging and interval
  • LOG_NODE_HEAPSTATS
    • string value of true or false (case insensitive) to enable the heap stats logging
  • LOG_NODE_HEAPSTATS_INTERVAL_MS
    • string value of a number (in milliseconds) representing the interval to log heap stats at
• Updated <type>.env.json files to add new env vars for visibility
• Updated config.js to look for new env var values

[qtomlinson]

Thank you for adding another tool to our troubleshooting toolkit!

[qtomlinson]

@mpcen @elrayle Our docker run command to run the service container may have to be adjusted (--memory) to reflect this change. Any thoughts?

[qtomlinson]

Thanks for the detailed documentation!

[elrayle]

Made the Copyright change a suggestion so we can get this merged.