Implement logging in Dash-Seedling 151

[jedheaj314]

Resolves #151

• Implements logging capability in Dash-Seedling app.
• Logs basic operation info messages in Dash-Seedling app.
• Consumes existing app insights environment variables (from app service config)
• Local monitoring support enabled through providing APPLICATIONINSIGHTS_CONNECTION_STRING env var
• Ensures logs generated by Dash-Seedling can be viewed in Application Insights on Azure.

Test Passed :

• Basic - Opens without error in dev container VS code.
• App container runs successfully.
• app.py runs successfully.
• With environment variable set with value in .env - logs can be seen in application insights.

[martinpeck]

Small "nit picking" comment, but otherwise LGTM.

Do you need to add the APPLICATIONINSIGHTS_CONNECTION_STRING into the deployment in a separate PR?

[t-young31]

I don't think APPLICATIONINSIGHTS_CONNECTION_STRING should be set for local, but apart from that – LGTM!

I would have

if os.environ.get("ENVIRONMENT", default="dev") == "local":
    return

in initialise_logging

[jedheaj314]

A

Small "nit picking" comment, but otherwise LGTM.

Do you need to add the APPLICATIONINSIGHTS_CONNECTION_STRING into the deployment in a separate PR?

APPLICATIONINSIGHTS_CONNECTION_STRING
this is already set in the previous changes outside this PR, just discussed this with James and no change is needed related to this in this PR.