Rename module xclim.indices to xclim.compute

[aulemahal]

Pull Request Checklist:

• This PR addresses an already opened issue (for bug fixes / features)
  • This PR fixes Stop using the word "indices" #2320
• Tests for the changes have been added (for bug fixes / features)
  • (If applicable) Documentation has been added / updated (for bug fixes / features)
• CHANGELOG.rst has been updated (with summary of main changes)
  • Link to issue (:issue:number) and pull request (:pull:number) has been added

What kind of change does this PR introduce?

• Expose ensembles and calendar directly on import xclim as xc.
• Remove xclim.xsdba
• But mostly : rename xclim.indices to xclim.compute

Functions previously called "indices" are now called "compute functions", with the additional qualifier "index-like" when needed. I tried to remove the word "indices" as much as possible, but preserved it when it actually meant the plural of "index" (like for SPI-like things) or when the usage comes from an external source (ex: "fire weather indices", "icclim indices").

Does this PR introduce a breaking change?

You bet it does!

Other information:

This must come with a major revision of the documentation, I might delete duplicate/useless notebooks. But I'll try to limit the changes to the subject here : indices vs indicators. Other documentation reorganisation/revision for v1 is to be done elsewhere.

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