Rename `get_schema()` (and helper functions) to `schema()`

[peterdesmet]

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With #262 we plan to introduce a version(), a function that doesn't start with a verb. This is similar to some camtrapdp functions (version(), deployments(), etc.). The functions have the advantage that they can have an equivalent set function version()<-.

Frictionless currently has other verb-less functions, mainly resources() (and also example_package() and the private locale(), col_types(), ...).

For consistency, I think we then need:

version() # new
version()<- # new
resources()
schema() # currently not the case
create_schema() # creates a schema from a data frame, doesn't "get" it

The alternative is:

get_version() # new
set_version() # new
get_resources() # currently not the case
get_schema()
create_schema() # creates a schema from a data frame, doesn't "get" it

That alternative is less appealing to me. @PietrH @sannegovaert @damianooldoni thoughts?

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If we implement this:

• [ ] Rename get_schema() to schema()
• [ ] Deprecate get_schema()
• [ ] Rename private function get_resource() to resource()
• [ ] Change description for GitHub issue label function:get

[PietrH]

I don't think we need to rename internal helpers, it's to our benefit that we avoid collisions there as much as possible. I have no issue with renaming get_schema() and get_resource(), but if we are retooling completely for a v2, then maybe we should consider packaging the frictionless object in such a way that these functions aren't needed for users to access these properties.