⚡ Utilize std::string_view instead of std::string in many places to improve performance

[marcelwa]

Description

This PR improves the performance of many string-based functions by switching to std::string_view and thus avoiding string copy costs.

Checklist:

• The pull request only contains commits that are related to it.
• I have added appropriate tests and documentation.
• I have made sure that all CI jobs on GitHub pass.
• The pull request introduces no new warnings and follows the project's style guidelines.

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"

[codecov]

Codecov Report

Merging #153 (d802e23) into main (ebe0543) will increase coverage by 0.00%.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #153   +/-   ##
=======================================
  Coverage   94.00%   94.00%           
=======================================
  Files          76       76           
  Lines        7085     7090    +5     
=======================================
+ Hits         6660     6665    +5     
  Misses        425      425           

Impacted Files	Coverage Δ
include/fiction/io/dot_drawers.hpp	93.29% <100.00%> (+0.14%)	⬆️
include/fiction/io/network_reader.hpp	65.95% <100.00%> (+0.74%)	⬆️
include/fiction/io/read_fqca_layout.hpp	98.68% <100.00%> (ø)
include/fiction/io/read_sidb_surface_defects.hpp	100.00% <100.00%> (ø)
include/fiction/layouts/cell_level_layout.hpp	100.00% <100.00%> (ø)
include/fiction/layouts/clocking_scheme.hpp	97.22% <100.00%> (ø)

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update e5dc4dd...d802e23. Read the comment docs.

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"