feat: initialize Kurdistan SDK - independent fork of Polkadot SDK

substrate/primitives/tracing/README.md

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+Substrate tracing primitives and macros.
+
+To trace functions or individual code in Substrate, this crate provides [`within_span`]
+and [`enter_span`]. See the individual docs for how to use these macros.
+
+Note that to allow traces from wasm execution environment there are
+2 reserved identifiers for tracing `Field` recording, stored in the consts:
+`WASM_TARGET_KEY` and `WASM_NAME_KEY` - if you choose to record fields, you
+must ensure that your identifiers do not clash with either of these.
+
+Additionally, we have a const: `WASM_TRACE_IDENTIFIER`, which holds a span name used
+to signal that the 'actual' span name and target should be retrieved instead from
+the associated Fields mentioned above.
+
+License: Apache-2.0