First attempt: Simple API

[akdor1154]

This is an attempt at a high-level simple API for the Sumo library. (see #32)

Usage:

fields, messages, records = sumo.simple.search("""
  _sourceCategory=nginx/prod
  error
""", startTime=timedelta(minutes=-60), endTime=None)

for m in messages:
  print(m['_raw'])

query is a string representing a Sumo query
startTime and endTime can be a datetime, a timedelta ( => now() + timedelta ), or the default None ( => now() )

messages and records are generators, the actual items are not retrieved until they are iterated. Each is just the dict of each messages/record as returned by the Sumo API.

There are a few caveats in the current implementation:

• requires Python 3.6 due to using type hints
• timezone handling could use some thought

However before looking at minutiae like that I wanted some feedback about the API, as that's the thing that should get nailed down first. Does this look halfway acceptable?

Cheers
Jarrad