json-subscriber 0.2.8

Customizable layer and subscriber for `tracing` that emits logs in JSON
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pub(super) const CURRENT_SPAN: &str = "span";
pub(super) const FIELDS: &str = "fields";
pub(super) const FILENAME: &str = "filename";
pub(super) const LEVEL: &str = "level";
pub(super) const LINE_NUMBER: &str = "line_number";
pub(super) const SPAN_LIST: &str = "spans";
pub(super) const TARGET: &str = "target";
pub(super) const THREAD_ID: &str = "threadId";
pub(super) const THREAD_NAME: &str = "threadName";
pub(super) const TIMESTAMP: &str = "timestamp";