Add switch and metadata to separate algorithm approach types

[Neiko2002]

Algorithms are currently not grouped by their underlying approach, which makes comparisons between fundamentally different methods unreliable. For example, comparing hnswlib with Glass is misleading since one is graph-based and the other combines graph and quantization.

Possible Solution:

• Require each author to specify the underlying algorithm type when submitting a method (e.g., graph-based, quantized, tree-based, hashing, neural, hybrid, etc.).
• Add this classification as metadata to the benchmark configuration.
• Extend the website visualization with a selector to filter and compare results by approach type.

This would support more transparent evaluations, fairer comparisons, and clearer research interpretation.