Add concepts and concrete types where possible for `BlockZipperJoinImpl`

[RobinTF]

Just a small follow-up to #1616 that narrows down types where possible to avoid having to guess which type is used. Not quite sure if the "SameAsAny" stuff helps readability though.

[sparql-conformance[bot]]

Conformance check passed ✅

No test result changes.

Details: https://qlever.cs.uni-freiburg.de/sparql-conformance-ui?cur=c75d100863c1b02418b8a89e15160c837d733b11&prev=55e0617ba75182958fc16579eaad6731b4a54ea2

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 94.44444% with 2 lines in your changes missing coverage. Please review.

Project coverage is 89.28%. Comparing base (55e0617) to head (c75d100).

Files with missing lines	Patch %	Lines
src/util/JoinAlgorithms/JoinAlgorithms.h	94.44%	0 Missing and 2 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1625 +/- ## ========================================== - Coverage 89.28% 89.28% -0.01% ========================================== Files 374 374 Lines 35608 35613 +5 Branches 4019 4019 ========================================== + Hits 31792 31796 +4 Misses 2520 2520 - Partials 1296 1297 +1 ```

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[sonarcloud[bot]]

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 SonarQube Cloud