[micro_wake_word] Version 2 Documentation

[kahrendt]

Description:

Adds documentation for microWakeWord version 2. It supports multiple wake words simultaneously. It also adds an optional Voice Activity Detector to reduce false activations from non-speech noises.

Related issue (if applicable): not applicable

Pull request in esphome with YAML changes (if applicable): esphome/esphome#7032

Checklist:

• I am merging into next because this is new documentation that has a matching pull-request in esphome as linked above.
  or

• I am merging into current because this is a fix, change and/or adjustment in the current documentation and is not for a new component or feature.

• Link added in /index.rst when creating new documents for new components or cookbook.

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[kahrendt]

Is it within the scope of this documentation to mention adding the CONFIG_ESP32_DEFAULT_CPU_FREQ_240: "y" to the sdkconfig_options if running many models? An ESP32 can run 2 models without it and 3 with it. Should I also mention the expected number of models that can run simultaneously?