minor efficiency improvements and code cleanup

[svdrecbd]

Changes:

• MinCollector: Updated the sort comparator to use block-identity checks instead of deep set comparisons.
• KmerIndex: Replaced the shading map lookup with a vector-based approach (using lazy allocation to avoid overhead in standard runs).
• ProcessReads: Removed a redundant linear search in the strand-specific mapping logic.
• Indexing: Minor refactor of amino acid translation to reduce heap allocations.
• Bifrost: Fixed a small member-access compilation error in the submodule.

Bug Fixes:

Fixed a compilation error in ext/bifrost submodule (DataStorage.tcc) where an incorrect member variable was accessed, preventing successful builds on some architectures.

Verification:

All changes were verified to produce bit-exact output identical to the current master branch. While end-to-end runtime improvements are modest on standard datasets where I/O dominates, these changes improve the algorithmic efficiency of the targeted functions.