performancecopilot / speed / 289

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metrics: add support for nultidimensional composite metrics

- adds support for multidimensional metrics based on @saurvs's work in
hornet without introducing any breaking behavior. Existing enums work,
a megabyte/second unit can be initialized as

  ```go
  u := speed.MegabyteUnit.Time(speed.SecondUnit, -1)
  ```

- adds a `Reset` nethod on Timer, which allows reseting the timer's
stored elapsed time back to zero

- a new example to demonstrate construction of composite units as well
as the `Reset` function

- corresponding changes in MMVDump with an updated dunp syntax for units
based on hornet. Additional test case added and existing modified to
accomodate the change.

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