✨ [RUM-1062] add a prefix to all console message displayed by the SDK

[BenoitZugmeyer]

Motivation

Mentioning that the message come from the Datadog Browser SDK could help users figure out what's wrong, especially when they are using multiple RUM SDKs at the same time.

See #2414 (comment)

Changes

Add a Datadog Browser SDK: prefix to all messages displayed by the SDK.

Testing

• Local
• Staging
• Unit -- no unit test as it's not easy to test: we would need to mock the console before binding its methods, but binding those methods during module evaluation is by design: we want to make sure we keep a reference to them before any instrumentation occurs.
• End to end

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I have gone over the contributing documentation.

[BenoitZugmeyer]

/to-staging

[dd-devflow]

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[dd-devflow]

🚂 Branch Integration: this commit was successfully integrated

Commit e69125a546 has been merged into staging-38 in merge commit 293abff52f.

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