fix: write subconfig fields only if driver has value for this fields

Signed-off-by: Dmitriy Aleksandrov <[email protected]>

add MIT licence

Signed-off-by: Dmitriy Aleksandrov <[email protected]>

src: add ability to parse configs partialy by subconfigs in registred…

… configs fields

Signed-off-by: Dmitrii Aleksandrov <[email protected]>

drivers: env: do not add configs from .env files if this ENV is alrea…

…dy exist

Signed-off-by: Dmitrii Aleksandrov <[email protected]>

env tests added

add docs

[+] added zapLogger

[~] changed path

change module path in go.mod

workflows: add go build and test coverage