Add example generation code, update examples to new encoding

.gitmodules

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+[submodule "examples/lib/miracl-core"]
+	path = examples/lib/miracl-core
+	url = https://github.com/miracl/core.git

examples/Cargo.toml

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+[package]
+name = "cose-bls-key-representations-examples"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+base64 = "0.22.1"
+mcore = { path = "./lib/miracl-core/rust/mcore" }
+serde = "1.0.228"
+serde_cbor = "0.11.2"

examples/README.md

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+
+# Setup
+
+```sh
+$ ./setup.sh
+```
+
+
+# Running
+
+```sh
+$ cargo run
+```

examples/miracl-sign.patch

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+diff --git a/rust/fp.rs b/rust/fp.rs
+index d6d4785..54dcdd6 100644
+--- a/rust/fp.rs
++++ b/rust/fp.rs
+@@ -68,7 +68,7 @@ pub const OMASK: Chunk = (-1) << (MODBITS % big::BASEBITS);
+ pub const TBITS: usize = MODBITS % big::BASEBITS; // Number of active bits in top word
+ pub const TMASK: Chunk = (1 << TBITS) - 1;
+
+-pub const BIG_ENDIAN_SIGN: bool = false;
++pub const BIG_ENDIAN_SIGN: bool = true;
+
+ impl FP {
+     /* Constructors */

examples/setup.sh

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+#!/bin/sh
+
+git submodule update --init --recursive lib/miracl-core
+(cd lib/miracl-core/rust && git reset --hard && git clean -dfx . && git apply ../../../miracl-sign.patch && python3 config64.py 31 39)