Implicit Includes support

[iromeo]

Code insight support for case

# foo.smk
rule foo:
  output: "foo.out"

# boo.smk
rule boo:
  input: rules.foo.output
  output: "out"

# Snakefile
include "foo.smk"
include "boo.smk"

# other.smk
rule other:
   output: "other.out"

In this case all rules from foo.smk and rules defined before include "boo.smk" will be accessible inside boo.smk file although boo.smk doesn't include 'foo.smk`.

We likely need to cache information about which files includes the current file. E.g it could be done lazily by inspection in thread-safe way. E.g. like PyTypes cache.

So we need

• Update rule redeclaration inspection to handle such implicit redeclaration (likely weak warning)
• Implement inspection which checks whether rule is implicitly included into current context or not. E.g. it is ok to use foo rule in boo.smk but we cannot use other rule in boo.smk
• Optionally update default autocompletion mentioned in In rules/checkpoint completion: show all names only on 2nd auto-completion invocaton #173

[iromeo]

Related to #155, #173

[iromeo]

Related commits:

3a650a3

828750c