callWithRetry updates, add back node-fetch polyfill due to unsolved SocketClosed error

[twelch]

• callWithRetry
  • add optional ifErrorMsgContains string, will now retry unless error message contains that string.
  • add exponential backoff so that there is a an increasing wait before the next retry.
• rasterStats will now catch geoblaze vrm error when passing zeroSketch, and return rasterStat default values in that case, rethrow all other errors.
• add back node-fetch polyfill to cog and flatgeobuf to solve SocketError showing up during high volume network call situation (e.g. smoke tests).