Add some statistics to lazy operations

[joka921]

No description provided.

[sparql-conformance]

Conformance check passed ✅

No test result changes.

Details: https://qlever.cs.uni-freiburg.de/sparql-conformance-ui?cur=38e17a47d15986fba4d7b3b2fbd6359117ac7905&prev=76801770cbdb2165462c649690471a922efb09d3

[codecov]

Codecov Report

Attention: Patch coverage is 93.75000% with 1 line in your changes missing coverage. Please review.

Project coverage is 89.45%. Comparing base (7680177) to head (38e17a4).
Report is 22 commits behind head on master.

Files with missing lines	Patch %	Lines
src/engine/Filter.cpp	92.30%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1652      +/-   ##
==========================================
+ Coverage   89.43%   89.45%   +0.01%     
==========================================
  Files         375      375              
  Lines       36338    36345       +7     
  Branches     4100     4100              
==========================================
+ Hits        32499    32512      +13     
  Misses       2518     2518              
+ Partials     1321     1315       -6     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

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

See analysis details on SonarQube Cloud