collectors: add Struct collector and StructToMap#63
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Add a reflection-based collector that reads configuration straight from a Go struct, plus a standalone helper exposing the same conversion. - collectors.Struct streams a struct's fields as configuration values, using `config` struct tags (falling back to `yaml`), the `-` skip directive, and the `omitempty` and `inline` options; key order is preserved by default. - collectors.StructToMap converts a struct (or a pointer to one) into a map[string]any with the same tag rules, returning ErrNotStruct for non-struct input.
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Adds a reflection-based
collectors.Structthat reads configuration straight from a Go struct, alongside the standalonecollectors.StructToMaphelper that exposes the same conversion.Field names come from the
configstruct tag, falling back toyaml, then the lowercased field name. The-directive skips a field,omitemptyskips zero values, andinlinemerges a struct/map field's keys into the parent (anonymous fields withoutinlinenest under the lowercased type name). Unexported fields are ignored except those promoted from an embedded struct. Internally the struct is turned into amap[string]anyand flattened the same way as theMapcollector, so it behaves consistently; key order is preserved by default likeYamlFormat. Non-struct input yields no values from the collector, andErrNotStructfromStructToMap.Includes unit tests, a runnable example, doc updates, and a changelog entry.