feat(config): wire tracer/meter/logger configurator experimental fields

[ocelotl]

The declarative configuration schema defines three experimental per-signal configurator extension points:

• tracer_provider.tracer_configurator/development
• meter_provider.meter_configurator/development
• logger_provider.logger_configurator/development

These let a config file inject per-instrumentation-scope overrides into a signal provider (e.g. disable a noisy tracer by name-glob, set per-logger minimum severity) without touching global provider config.

All three are parsed into dataclass instances in models.py (ExperimentalTracerConfigurator, ExperimentalMeterConfigurator, ExperimentalLoggerConfigurator) but are never read by configure_tracer_provider(), configure_meter_provider(), or configure_logger_provider() — the fields are silently discarded.

Related: #3631

[ocelotl]

@open-telemetry/python-maintainers please assign this issue to me