Add reset method toProgressReporterAbstract

[chrisjsewell]

This PR adds the update method to the progress reporter.
This in-turn, allows for the implmentation of a callback mechanism in ArchiveReaderAbstract.iter_node_repos.
The callback implmentation is taken from the disk-objectstore package, and so facilitates a later migration to its use.

The PR also moves the (common) repository import code out of the backend specific modules, reducing code duplication.

This PR is intended to facilitate the transition to the new node repository in #4345

[chrisjsewell]

I've tested this against my 40,000 node archive, and looks to be all be working as expected:

$ verdi import -v DEBUG tmp/mount_folder/out.aiida 
Info: importing archive tmp/mount_folder/out.aiida
Calling import function import_data_dj for the django backend.

IMPORT
--------  ---------
Archive   out.aiida

Parameters
--------------------------  ------
Comment rules               newest
New Node Extras rules       import
Existing Node Extras rules  kcl
CHECKING IF NODES FROM LINKS ARE IN DB OR ARCHIVE...
CREATING PK-2-UUID/EMAIL MAPPING...
Importing 40066 entities
ASSESSING IMPORT DATA...
Finding existing entities - User         100.0%|████████████████████████████████████████████████████| 1/1
Reading archived entities - User         100.0%|████████████████████████████████████████████████████| 1/1
Reading archived entities - Node         100.0%|████████████████████████████████████████████| 40065/40065
STORING ENTITIES...
Users -  existing entries                100.0%|████████████████████████████████████████████████████| 1/1
CREATING NEW NODE REPOSITORIES...
Iterating node repositories              100.0%|████████████████████████████████████████████| 40065/40065
Nodes -  storing new                     100.0%|████████████████████████████████████████████| 40065/40065
STORING NODE LINKS...
Links - label=input                      100.0%|████████████████████████████████████████████| 40064/40064
   (40064 new links...)
STORING GROUP ELEMENTS...
Done (cleaning up)                       100.0%|████████████████████████████████████████████| 40065/40065

Summary
-----------------------  ---------------
Auto-import Group label  20201028-032117
User(s)                  1 existing
Node(s)                  40065 new
Link(s)                  40064 new

Success: imported archive tmp/mount_folder/out.aiida

[codecov]

Codecov Report

Merging #4522 into develop will increase coverage by 0.01%.
The diff coverage is 87.33%.

@@             Coverage Diff             @@
##           develop    #4522      +/-   ##
===========================================
+ Coverage    79.39%   79.40%   +0.01%     
===========================================
  Files          480      480              
  Lines        35080    35087       +7     
===========================================
+ Hits         27850    27858       +8     
+ Misses        7230     7229       -1     

Flag	Coverage Δ
#django	73.53% <85.92%> (+0.03%)	⬆️
#sqlalchemy	72.70% <85.92%> (+0.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
aiida/tools/importexport/archive/readers.py	86.37% <81.82%> (+0.17%)	⬆️
aiida/common/progress_reporter.py	91.12% <83.34%> (-5.76%)	⬇️
...ida/tools/importexport/dbimport/backends/common.py	98.51% <100.00%> (+0.51%)	⬆️
...ida/tools/importexport/dbimport/backends/django.py	92.94% <100.00%> (-0.14%)	⬇️
aiida/tools/importexport/dbimport/backends/sqla.py	93.71% <100.00%> (-0.12%)	⬇️
aiida/engine/daemon/runner.py	79.32% <0.00%> (-3.44%)	⬇️
aiida/transports/plugins/local.py	81.54% <0.00%> (+0.26%)	⬆️
aiida/engine/daemon/client.py	73.57% <0.00%> (+1.15%)	⬆️

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[ltalirz]

Just some questions before approving (see comments)

[ltalirz]

Thanks @chrisjsewell !