make scoped logger work with logger objects with non-int level

[HoneyryderChuck]

What was changed

This patch fixes scoped loggers by allowing a escape hatch for logger objects with non-integer levels; just call #upcase (which both strings and symbols support) and pass it to Logger::Severity.const_get.

Why?

Logger#level returns an integer, however many other logger libraries in ruby land don't do that, most notably semantic_logger, which is nowadays recommended by rails for structured logging; SemanticLogger::Logger objects return #level as a symbol (ex: :info).

Checklist

1. Closes [Bug] Does not support semantic_logger #472

2. How was this tested:

require "semantic_logger"
require "temporalio"

logger = SemanticLogger["MyApp"]
scoped_logger = ScopedLogger.new(logger)
scoped_logger.level #=> 1, 2 ,3....

3. Any docs updates needed?

Don't think so, temporalio does not document support for logger libs.

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[chris-olszewski]

Please add some testing that exersices against Semantic Logger

[chris-olszewski]

There is still no testing against an actual semantic logger. I would feel far more comfortable with this change if we had some sort of regression testing to make sure our scoped logger is compatible.

[HoneyryderChuck]

@chris-olszewski missed the earlier notification. added the tests!

[chris-olszewski]

We need to update the RBS/RBI types so a semantic logger can be used here. Updating both to take a generic Object here probably makes sense.

[chris-olszewski]

Also, do you have control of @rogerwang-boop and could get it to sign the CLA?

[HoneyryderChuck]

@chris-olszewski added RBS/RBI sig changes. Also fixed the state of the branch ( @rogerwang-boop merged main instead of rebasing).