Feat: Improve Version 0.8.0

[riandyrn]

Changes Summary:

• Update otelhttp version to 0.49.0 since it is the version that uses otel 1.24.0 internally, check here for details.
• Remove the deprecated Jaeger exporter from multi-services example & use otlptrace exporter instead.
• Add WithPublicEndpoint & WithPublicEndpointFn options in #43.
• Set the go versions in compatibility-test.yml to 1.19, 1.20, & 1.21.
• Set the sampling strategy to always sample in test cases to avoid random error.