feat: use timerId instead of raw strings for timer identification

[97gamjak]

No description provided.

[pq-perf-bot]

⚡ Performance (instruction count) — ✅ no regressions

per-benchmark breakdown

benchmark	base Ir	PR Ir	Δ
bondedForces	38.24M	38.24M	-0.00%	✅
boxTransforms	10.67M	10.67M	+0.00%	✅
constraints	10.91M	10.94M	+0.22%	✅
coulombKernel	5.80M	5.80M	+0.00%	✅
forceKernel	14.16M	14.16M	-0.00%	✅
integrator	32.44M	32.44M	+0.00%	✅
interWater	1681.40M	1681.40M	+0.00%	✅
kinetics	8.55M	8.55M	+0.00%	✅
linearAlgebra	2.08M	2.08M	+0.00%	✅
nonCoulombPairs	5.48M	5.48M	+0.00%	✅
shiftVector	5.81M	5.81M	+0.00%	✅
virial	10.44M	10.44M	+0.00%	✅

_{Deterministic callgrind instruction counts vs the base branch; gated at ±2%. Not wall-clock.}

[codecov]

Codecov Report

❌ Patch coverage is 94.11765% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 91.01%. Comparing base (f5667ee) to head (66b01eb).

Files with missing lines	Patch %	Lines
src/timings/timerId.cpp	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #500      +/-   ##
==========================================
- Coverage   91.02%   91.01%   -0.02%     
==========================================
  Files         320      322       +2     
  Lines       14563    14574      +11     
  Branches     4825     4831       +6     
==========================================
+ Hits        13256    13264       +8     
- Misses       1221     1227       +6     
+ Partials       86       83       -3     

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