Add timezone package

[jamiechandler99]

Tested :

• q 3.5 and up
• Utility scripts supports python 3.8 and above - must have requests installed but is the only external requirement

Notes:
Unsure best way to have this data sourced. Python to me is the most lightweight and easily automatable but does not really fit the objective of a standalone q package. That being said one way or another this package will be reliant on external data. This to me seemed good to include, although maybe for actually shipping of this package its included more as an aside.

Other options for this would be building out the HTTP q library and see if I can replicate this logic in q alone. Will take a look at that

[jonathonmcmurray]

We have a tzinfo file in TorQ (I think it's just a q flat file) https://github.com/DataIntellectTech/TorQ/blob/master/config/tzinfo (based off Kx supplied data at https://github.com/KxSystems/cookbook/tree/master/timezones)

Would it make sense to include that instead of the python script etc.? I guess we might have to update it periodically if countries change observance of DST etc. but that's probably pretty minimal

[jamiechandler99]

Updated to take from flat and provided steps for manual update. Have also aligned code with style.md taking this to be the golden source. Will also update other PRs to align as I work on them

[jonathonmcmurray]

Looks good, couple of minor points & something I need to update in style guide

[jamiechandler99]

Updated to reflect updated style guide for timezone ending brace, fixed unit test comments and added additional notes in doc that tzinfo is available by default and download steps are only needed for updating