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Add an overlay storage

vlorentz requested to merge generated-differential-D7838-source into master

I will use it to locally test incremental loads of large repositories which are already loaded in production, with read-only access of the production storage.

This may also be used in the future to access storages while migrating/replicating.

Test Plan

This is fully tested when the backend storages are empty (by inheriting the usual tests); and never tested when they are not (for now)

I also tried loading linux.git with this config:

storage:
  cls: pipeline
  steps:
    - cls: buffer
    - cls: filter
    - cls: overlay
      storages:
        - cls: memory
        - cls: remote
          url: http://webapp.internal.staging.swh.network:5002/

and it didn't use more than 4GB of RAM! (and my machined almost OOMed without the filter proxy), so it seems to work

Migrated from D7838 (view on Phabricator)

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