Add name prefixing to BP groups

[ahopkins]

Because of the removal of duplicate route naming, the following is no longer possible. This was a hidden use case that we did not have unit tests to cover, and so the change was not caught.

bp1 = Blueprint("bp1", url_prefix="/bp1")
bp2 = Blueprint("bp2", url_prefix="/bp2")

bp1.add_route(..., "/")
bp2.add_route(..., "/")

group_a = Blueprint.group(bp1, bp2, url_prefix="/group-a")
group_b = Blueprint.group(bp1, bp2, url_prefix="/group-b")

app.blueprint(group_a)
app.blueprint(group_b)

The solution is to add name_prefix to go along with version_prefix and url_prefix to the BlueprintGroup. This will allow proper constructing and nesting of blueprints and groups.

---

TODO:

• Tests

[codecov]

Codecov Report

Patch coverage: 100.000% and project coverage change: +0.074 🎉

Comparison is base (f48506d) 88.887% compared to head (b425af0) 88.962%.

❗ Current head b425af0 differs from pull request most recent head 13da6e2. Consider uploading reports for the commit 13da6e2 to get more accurate results

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #2727       +/-   ##
=============================================
+ Coverage   88.887%   88.962%   +0.074%     
=============================================
  Files           92        92               
  Lines         6956      6967       +11     
  Branches      1185      1187        +2     
=============================================
+ Hits          6183      6198       +15     
+ Misses         529       527        -2     
+ Partials       244       242        -2     

Impacted Files	Coverage Δ
sanic/app.py	90.152% <100.000%> (+0.050%)	⬆️
sanic/blueprint_group.py	100.000% <100.000%> (ø)
sanic/blueprints.py	91.549% <100.000%> (+0.161%)	⬆️

... and 1 file with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.

The base branch was changed.