Update on CommonVoice

[mthrok]

For master branch;

• Revert "no longer download CommonVoice directly (#1018)" #1079 Revert no longer download CommonVoice directly #1018
• [BC-Breaking] Disallow download=True in CommonVoice #1080 Disallow download=True (cherry-pick [0.7.1] Disallow download=True in CommonVoice #1076)
• [BC-Breaking] Remove download and change root directory of CommonVoice #1082 Remove execution paths for download=True and clean up the code
• Deprecate download/url args and add language arg in CommonVoice #1083 Superseded by updated [BC-Breaking] Remove download and change root directory of CommonVoice #1082
  • Deprecate download and url argument
  • Introduce language argument.
    The introduction of language argument should come with the team's agreement.
• Update the default version. Version parameter is deprecated and no longer used.
  This has to be a separate commit as this deserves a dedicated line in 0.8 release note.

For release 0.7.1 branch;

• Revert "[Cherry-pick for 0.7.1] no longer download CommonVoice direct… #1075 Revert [Cherry-pick for 0.7.1] no longer download CommonVoice directly #1065
• [0.7.1] Disallow download=True in CommonVoice #1076 Disallow download=True