fix(types): make logger.trace an optional function

[trivikr]

Issue

• Internal JS-3681
• Follow-up to chore(types): add trace function to logger #4104

Description

Makes trace an optional function on logger, to preserve backward compatibility.
The logger enforced functions debug, info, warn, error since GA. Adding trace should be optional to not break folks who're using logger without trace function.

Testing

Verified that unit test for package middleware-sdk-s3 which mocks logger is successful

$ middleware-sdk-s3> yarn test
...
Test Suites: 4 passed, 4 total
Tests:       19 passed, 19 total
Snapshots:   0 total
Time:        4.587 s
Ran all test suites.
Done in 5.78s.

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