Adding Calibration Conditions payload and SQLite backend

[fayuce]

PR description:

This PR introduces an HGCal calibration Conditions payload and record,
together with a SQLite writer and an EventSetup-based reader for RecHit
reconstruction.

The existing reconstruction path, in which calibration constants are read
from JSON, is preserved and remains available. The new path stores the same
calibration content in a local SQLite Conditions database and retrieves the
payload through the CMSSW EventSetup during reconstruction.

The implementation includes:

• calibration payload and EventSetup record;
• registration of the payload with the CMSSW Conditions infrastructure;
• a writer that serialises the calibration constants into SQLite;
• an EventSetup producer that provides the constants to RecHit reconstruction;
• configuration support for selecting either the JSON calibration source or
  the SQLite Conditions source.

PR validation:

• Successfully compiled with CMSSW_16_1_0.
• Reconstruction was performed using identical RAW input, geometry, detector
  mapping and calibration content for the JSON and SQLite Conditions sources.
• 10,000 events were matched.
• 22,480,000 HGCHit energy values were compared.
• Energy mismatches: 0.
• Maximum absolute difference: 0.