Make conda-store server launch uvicorn with log level

[soapy1]

Fixes # #516
(along with #903)

Description

This change ensures that the log level set by the CondaStoreServer.log_level config gets applied to the uvicorn server. The default behaviour remains the same, that is, the log level is set to INFO by default (this is the default by uvicorn when the log_level is not set).

To test this out, try running a conda-store server with the following configs:

See info level logging (currently, the only option)

c.CondaStoreServer.log_level = logging.INFO

See critical level logging (pretty much no logs output)

c.CondaStoreServer.log_level = logging.CRITICAL

Pull request checklist

• Did you test this change locally?
• Did you update the documentation (if required)?
• Did you add/update relevant tests for this change (if required)?

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[peytondmurray]

Looks good to me: https://www.uvicorn.org/settings/#logging