feat: `Bueno.testing.{test,bench}`

[Im-Beast]

Adds basic testing/benchmarking functions to Bueno.testing.

Bueno.testing.test currently:

• supports sub-tests
• ensures that:
  • contexts aren't misused
  • that new tests aren't getting started before previous ones finished
  • async ops aren't leaking

Currently implemented comparisons for Bueno.testing.test:

• equals
• notEquals
• deepEquals
• notDeepEquals
• throws
• notThrows
• rejects
• notRejects
• satisfies
• notSatisfies
• almostEquals
• notAlmostEquals

Bueno.testing.bench is very simple for now, it only prints how long it took on average to run the function.

Code is not well documented and not that clean yet. It also includes some simple fixes to console spotted along the way