Resolve/completion for rules names

[jetbrains-research]

Resolve/completion for rules names

[iromeo]

Please check could we use rule name inside rule with same name. E.g. smth like:

rule foo:
  input: rules.foo.input[0]
  output: rules.foo.input[0]
  run:
     print(rules.foo.input[0])

So may be we need to remove wrapping rule name from completion list + add some inspection that this behaviour isn't supported by snakemake

[iromeo]

Also probably is good to show multi-resolve if you have several rules with the same name somewhere in the project.

[iromeo]

Need to check does rules. allows to access to checkpoints or not

[iromeo]

Please check could we use rule name inside rule with same name. E.g. smth like:
...
So may be we need to remove wrapping rule name from completion list + add some inspection that this behaviour isn't supported by snakemake

Inspection implemented in #101