Currently the replit library has a very gross quirk: it has a global in
`replit.database.default_db.db`, and the mere action of importing this
library causes side effects to run! (connects to the database, starts a
thread to refresh the URL, and prints a warning to stdout, adding insult
to injury).

So we're trading that very gross quirk with a gross workaround to
preserve backwards compatibility: the modules that somehow end up
importing that module now have a `__getattr__` that _lazily_ calls the
code that used to be invoked as a side-effect of importing the library.
Maybe in the future we'll deploy a breaking version of the library where
we're not beholden to this backwards-compatibility quirck.

Providing accessors, to hint that we are accessing mutable state

An issue with LazyDB is that the refresh_db timer would not get canceled
if the user closes the database.

Additionally, the db_url refresh logic relies on injection, whereas the Database should ideally be the thing requesting that information from the environment