Increase default db-cache-size to 1GiB

[wojciechos]

Increased the default db-cache-size from 8MB to 1GiB to improve sync performance. Profiling showed high CPU usage and frequent DB access during block sync, particularly with larger blocks. This cache increase helps reduce I/O overhead and speeds up access to stored data, resulting in better performance for syncing nodes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.60%. Comparing base (5cd51d8) to head (aea2165).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2244      +/-   ##
==========================================
- Coverage   75.63%   75.60%   -0.03%     
==========================================
  Files         104      104              
  Lines       11102    11102              
==========================================
- Hits         8397     8394       -3     
- Misses       2073     2075       +2     
- Partials      632      633       +1     

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