Add support for OpenTelemetry metrics

[tjquinno]

Helidon Version: 4.4.x

Enhancement Description

Add support in Helidon for OpenTelemetry metrics:

• Allow configuration of OTel metrics using Helidon config
• Honor the OTel metrics semantic conventions (which meters are recorded, names, tags, etc.)
• Support export of Helidon metrics via OpenTelemetry metrics exporter(s)