Refine autonaming to have more intuitive behavior (bp #1660) (#1662)

* Refine autonaming to have more intuitive behavior (#1660)

* Refine autonaming to have more intuitive behavior

Last name in an Expression wins, while the first Statement to name wins.
This is done via checking the _id of HasIds during autonaming and only
applying a name if the HasId was created in the scope of autonaming.
There is no change to .autoSeed or .suggestName behavior.

Behavior of chisel3-plugins from before this change is maintained.

* Update docs with naming plugin changes

(cherry picked from commit 1260f7c8

)

* Waive binary incompatibility false positive in 2.11

Co-authored-by: Jack Koenig <koenig@sifive.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>