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Don't drop constraints and indexes for tables that are ignored by the metadata
generator given to the store. One may now easily disable insertion of e.g.
created_by / owned_by by removing them from the MetadataGenerator.META_RELATIONS
set, in which case indexes for associated table won't be removed by the massive
store.

This should be done on the instance rather than on the class

This was not necessary anymore with promoted usage of the new data import API.
Turn repository's _type_extid_cache to _type_cache with only the entity's type
as key.

This introduces an backward incompatible change: entity_metas dict doesn't
contains anymore the extid key, but it doesn't seem used at all anywhere, so
this sounds acceptable.

Closes #15538317

This is useful to do some import tests where you only want to test steps prior
to the database insertion, as well as "dry-run" commands.

Use it as a documenting base class.

with a similar-but-different API that will allow its usage by the massive store
(no more entity object manipulation), while making it a bit more flexible for
customization by subclasses (experience taken from client code).

Related to #10338621

so it's clearly not the samething as metagenerator.source. Also add a bit of doc
along the way.

Basically:

mkdir cubicweb
hg mv *.py -X setup.py cubicweb
hg mv dataimport devtools entities etwist ext hooks i18n misc schemas server skeleton sobjects test web wsgi cubicweb

Other changes:

* adjust path to cubicweb-ctl in devtools tests
* update setup.py to avoid importing __pkginfo__ (exec it instead),
  replace os.path.walk by os.walk and prepend `modname` here and there
* update tox.ini to account for new test locations
* update doc/conf.py so that it still finds __pkginfo__.py and CWDIR in
  doc/Makefile