Refactor ConstructExportContext to use IdTable and LocalVocab instead of Result

[RobinTF]

This is a small preparation for lazy operations (see #1350)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.62%. Comparing base (3fad814) to head (8e115a8).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1433      +/-   ##
==========================================
- Coverage   89.63%   89.62%   -0.02%     
==========================================
  Files         343      343              
  Lines       29951    29951              
  Branches     3315     3315              
==========================================
- Hits        26847    26844       -3     
- Misses       1957     1962       +5     
+ Partials     1147     1145       -2     

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[joka921]

This is a small preparation for lazy operations (see #1350)