🚚 [#59] moved the old api to legacy file

[bart-maykin]

fixes #59

Moved old api code to legacy file
merged the models used for the old api together in the admin under the label legacy
changed the old api version to be v0.

[codecov-commenter]

Codecov Report

Merging #89 (610b609) into master (5ca61b0) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #89      +/-   ##
==========================================
+ Coverage   96.23%   96.26%   +0.02%     
==========================================
  Files         102      102              
  Lines        3586     3588       +2     
==========================================
+ Hits         3451     3454       +3     
+ Misses        135      134       -1     

Files	Coverage Δ
...lant/components/legacy/contactmomenten/__init__.py	100.00% <100.00%> (ø)
...enklant/components/legacy/contactmomenten/admin.py	100.00% <ø> (ø)
...nt/components/legacy/contactmomenten/api/audits.py	100.00% <ø> (ø)
...lant/components/legacy/contactmomenten/api/auth.py	100.00% <ø> (ø)
...t/components/legacy/contactmomenten/api/filters.py	100.00% <100.00%> (ø)
...t/components/legacy/contactmomenten/api/kanalen.py	100.00% <100.00%> (ø)
...nt/components/legacy/contactmomenten/api/schema.py	100.00% <ø> (ø)
...nt/components/legacy/contactmomenten/api/scopes.py	100.00% <ø> (ø)
...mponents/legacy/contactmomenten/api/serializers.py	98.71% <100.00%> (ø)
...ents/legacy/contactmomenten/api/tests/test_auth.py	100.00% <100.00%> (ø)
... and 50 more

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[joeribekker]

Ziet er goed uit MAAR om backwards compatibility te behouden wil ik de API URL toch niet wijzigen. Dan krijgen we maar /api/v1/klanten/ en /api/v1/klantinteracties/ naast elkaar...

Codewise is het in orde, dus enkel de URL patterns.