docs(readme): badge row and the widened debug feature

Adds crates.io version and downloads, docs.rs, MSRV and stars to the badge
row, alongside the CI, license, Scorecard and dependency badges already there.

The debug feature description no longer says 'parser': it now also covers the
opcode helpers and call-stack walking added in this release.

Author: NullSablex

CHANGELOG.md

@@ -58,6 +58,8 @@ piece was already running against live SA-MP and open.mp servers.
   call stack.
 - [API reference](docs/api-reference.md) updated with the new `Amx` methods and
   the widened `samp::debug` surface.
+- README: the `debug` feature is no longer described as only a parser, and the
+  badge row gains crates.io version and downloads, docs.rs, MSRV and stars.
 
 ### Crate versions
 

README.md

@@ -1,4 +1,9 @@
 [![CI](https://github.com/NullSablex/rust-samp/actions/workflows/rust.yml/badge.svg)](https://github.com/NullSablex/rust-samp/actions/workflows/rust.yml)
+[![crates.io](https://img.shields.io/crates/v/rust-samp?logo=rust)](https://crates.io/crates/rust-samp)
+[![downloads](https://img.shields.io/crates/d/rust-samp?logo=rust&label=downloads)](https://crates.io/crates/rust-samp)
+[![docs.rs](https://img.shields.io/docsrs/rust-samp?logo=docsdotrs&label=docs.rs)](https://docs.rs/rust-samp)
+[![MSRV](https://img.shields.io/crates/msrv/rust-samp?label=MSRV)](Cargo.toml)
+[![stars](https://img.shields.io/github/stars/NullSablex/rust-samp?logo=github)](https://github.com/NullSablex/rust-samp/stargazers)
 [![License: MIT](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
 [![OpenSSF Scorecard](https://api.scorecard.dev/projects/github.com/NullSablex/rust-samp/badge)](https://scorecard.dev/viewer/?uri=github.com/NullSablex/rust-samp)
 [![dependency status](https://deps.rs/repo/github/NullSablex/rust-samp/status.svg)](https://deps.rs/repo/github/NullSablex/rust-samp)
@@ -103,8 +108,10 @@ are 32-bit.
   loads on Open Multiplayer in legacy mode.
 - `encoding` — Windows-1251 / Windows-1252 string conversion via
   `encoding_rs`.
-- `debug` — the `samp::debug` AMX_DBG debug-info parser, for building
-  debuggers/tooling on the VM (see [VM Debugging](docs/vm-debugging.md)).
+- `debug` — `samp::debug`: the AMX_DBG debug-info parser plus the opcode
+  helpers (numbering, instruction sizes, the computed-goto `OpcodeMap`) and
+  call-stack walking, for building debuggers and tooling on the VM (see
+  [VM Debugging](docs/vm-debugging.md)).
 - `compression` — gzip-compress rotated log archives
   (`LoggerConfig::compress_archives`); pulls in `flate2`.