[STD]: `os` components for ENV

[emil14]

Basically we have low level and high level functionality and which one needs to be implemented first
is not clear

Low level

We need to mimic these Go's os functions

• GetEnv
• SetEnv
• Environ

High level

We need a way of defining the configuration structures without directly using the low level functions.

Reference https://github.com/sethvargo/go-envconfig

[emil14]

component GetEnv(name string) (data string, err error)

component SetEnv(name string, data string) (data string, err error)

Now about Environ - in Go it returns slice of key=value strings which doesn't looks handy.

component Environ(sig any) (seq stream<MapEntry<string>>, err error)

[emil14]

Generated Documentation

We could generate e.g. markdown file automatically from configuration

Reference https://github.com/g4s8/envdoc

We need to think tho what should be the source of truth - source code or some kind of schema. We could even have this inside neva.yaml and an env field