feat: move feature gates and set to be defined at startup level

[leoparente]

This pull request includes several significant changes to the cmd/main.go, config/config.go, go.mod, otlpinf/otlpinf_test.go, otlpinf/server.go, and runner/runner.go files. The changes focus on refactoring the configuration handling, updating dependencies, and improving test assertions. Below are the most important changes:

Configuration Handling:

• cmd/main.go: Removed viper dependency and replaced the initConfig function with direct configuration assignment in the Run function. Added new flags for Set and FeatureGates. [1] [2]
• config/config.go: Updated the Policy and Config structs to include Receivers, Processors, Exporters, Extensions, and Service fields. [1] [2]

Dependency Updates:

• go.mod: Removed several indirect dependencies and added new ones, including github.com/google/go-cmp and github.com/kr/pretty. [1] [2]

Test Improvements:

• otlpinf/otlpinf_test.go: Replaced error checks with assert statements from the testify package to improve readability and consistency in test assertions. [1] [2] [3] [4] [5] [6] [7]

Code Refactoring:

• runner/runner.go: Modified the New function to accept a config.Config pointer instead of individual parameters. Updated the Configure method to handle the new Policy struct format. [1] [2]

Test Refactoring:

• runner/runner_test.go: Updated tests to align with the new New function signature and Policy struct changes. [1] [2] [3] [4] [5]

[github-actions]

Go test coverage

STATUS	ELAPSED	PACKAGE	COVER	PASS	FAIL	SKIP
🟢 PASS	4.98s	github.com/netboxlabs/opentelemetry-infinity/otlpinf	88.8%	4	0	0
🟢 PASS	3.13s	github.com/netboxlabs/opentelemetry-infinity/runner	81.5%	5	0	0

Total coverage: 85.5%