Create inflate-netkan command

[HebaruSan]

Motivation

https://github.com/HebaruSan/inflate-netkan is a GitHub Action that is set up in the NetKAN and KSP2-NetKAN repos to allow org members to add a requested mod to the inflation queue:

• https://github.com/KSP-CKAN/NetKAN/blob/master/.github/workflows/manual_inflate.yml
• https://github.com/KSP-CKAN/KSP2-NetKAN/blob/master/.github/workflows/manual_inflate.yml

It works, but its implementation is not optimal:

• It's a core (if tertiary) part of the infrastructure that lives in my account rather than the main KSP-CKAN org, so it can't be maintained by anyone else without my participation
• It has a Dockerfile, which means there's a build step before it can be executed
• It internally hard-codes the names of the inflation queues for each game
• It imports Python code from NetKAN-Infra to create its own standalone mini command, which must violate some sort of layered design principle
• It was cobbled together based on snippets from the Scheduler, so even though there isn't much Python code, a lot of it is managing arrays that will only ever have one element

Changes

Now a simple new inflate-netkan command is created to add the netkan with the given identifier to the given inflation queue. This will allow the workflows in NetKAN and KSP2-NetKAN to use the already built kspckan/netkan container instead of building a new container on the fly (similar to KSP-CKAN/CKAN#4265).