[IMP] core: add support for multi-version migration scripts

A special folder named `0.0.0` can contain scripts that are run on
upgrade of any version.
They are useful to make some sanity checks or other verifications to
ensure database consistency.

The first version of this patch used the more eye-catching `any` for
the migration folder, but it was problematic for upgrading from an older
version that doesn't contain this patch.

Using a version "number" containing two dots is required to avoid it
being prefixed with the server version (see `convert_version` method) and
resulting in a version like `10.0.any`.
Such version would have been executed, even without this patch, when
upgrading from an older major server version (9.0.1.0 < 10.0.any).

closes odoo/odoo#34268

Signed-off-by: Christophe Simonis <chs@odoo.com>

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