standardize on env vars for py libs

[cjellick]

details to come. just clearing out todos from notes

[mbrevoort]

Not sure if this is related to your intention for this issue, but here's a case that's frustrating when working with arguments and inline python:

Consider this example:

Name: Text inline python args
Args: foo: an argument

#!python3
print(os.environ['foo'])

I would expect I can call it this way but it fails because the arguments are not populated in the environment. However, this same script would work if it were call as a tool from another gptscript:

gptscript testpy.gpt --foo bar
15:57:28 started  [main] [input=--foo bar]
15:57:28 sent     [main]
Traceback (most recent call last):
  File "/tmp/gptscript1115266740", line 1, in <module>
    print(os.environ['foo'])
          ^^
NameError: name 'os' is not defined. Did you forget to import 'os'?
15:57:28 failed to run tool [text inline python args] cmd [/usr/local/bin/python3 /tmp/gptscript1115266740]: exit status 1
2024/03/28 15:57:28 ERROR: Traceback (most recent call last):
  File "/tmp/gptscript1115266740", line 1, in <module>
    print(os.environ['foo'])
          ^^
NameError: name 'os' is not defined. Did you forget to import 'os'?
: exit status 1

Calling the same script works all the time this way:

$ foo=bar gptscript testpy.gpt
16:01:39 started  [main]
16:01:39 sent     [main]
16:01:39 ended    [main]

OUTPUT:

bar