Rename env keys

[tadeas-hejnic]

Changelog Description

Use more clear env variable names in ayon-usd addon.

Additional review information

AYONLOGGERLOGLVL -> AYON_USD_RESOLVER_LOG_LVL
AYONLOGGERFILELOGGING -> AYON_USD_RESOLVER_LOG_FILE_ENABLED
AYONLOGGERFILEPOS -> AYON_USD_RESOLVER_LOG_FILE

ENABLE_STATIC_GLOBAL_CACHE -> AYON_USD_RESOLVER_ENABLE_PINNING
PINNING_FILE_PATH -> AYON_USD_RESOLVER_PINNING_FILE
PROJECT_ROOTS -> AYON_USD_RESOLVER_PINNING_ROOTS

Testing notes:

The builds are available here: lakefs://ayon-usd/new-env-keys
This PR is tested along ynput/ayon-usd#119

1. Test basic workflow with resolver in DCCs
2. Test resolver in farm environment with pinning

[BigRoy]

New names do look better. We may need to update AYON USD addon along? And perhaps let some clients know? @MustafaJafar thoughts?

[MustafaJafar]

New names do look better. We may need to update AYON USD addon along? And perhaps let some clients know? @MustafaJafar thoughts?

This PR requires a counter part in ayon-usd addon. let me spin a PR to use the new keys.
About the documentation, I may need to update screenshots but most importantly, update any mentions for the new keys in https://help.ayon.app/en/help/articles/4862376-ayon-openusd-resolver

[tadeas-hejnic]

The PR in ayon-usd is already created.

[MustafaJafar]

I can see the logger file works as expected.

file logging is ON
Input log path: "H:\\logFile.json"
[AyonLogger] Initializing async file logger at: H:\logFile.json
[AyonLogger] Async file logger initialized successfully.

file logging is ON
Input log path: "E:\\Ynput\\tmp\\resolver_log\\logFile.json"
[AyonLogger] Initializing async file logger at: E:\Ynput\tmp\resolver_log\logFile.json
[AyonLogger] Async file logger initialized successfully.

before fileLoggerFilePath - E:\Ynput\tmp\resolver_log
file logging is OFF

before fileLoggerFilePath - 
file logging is OFF