Remove providers

[ittaiz]

Description

Remove remaining attributes.

This is part of a larger effort of removing all attributes we're returning and return only providers.
Attributes were either:

1. Moved to DefaultInfo provider
2. Removed because they were redundant (pre phases they were needed in internal communication)
3. Coverage which moved to its own provider

Followup on #913

Motivation

Be Bazel 3.0.0 compliant per this bazel issue and unifying on JavaInfo.

Note that this means the minimum version is 1.1.0 because of a JavaInfo issue that was fixed in 1.1.0 and breaks IJ integration.

[ittaiz]

This doesn't complete the task since we need to actually return an array of providers from run_phases but that will also involve changing the phases and their return value and such.
Will happen in followup PR.

BTW, this is based on #913 for ease of review

[ittaiz]

fails on linting. Will fix tomorrow

[ittaiz]

superseded by #916 (same content, more accurate name, branch name and git history)