change chunking mechanism of corelib

[enitrat]

corelib ingester should not split pages on headers

# ToSpanTrait

`ToSpanTrait` converts a data structure into a span of its data.

Fully qualified path: [core](./core.md)::[array](./core-array.md)::[ToSpanTrait](./core-array-ToSpanTrait.md)

<pre><code class="language-cairo">pub trait ToSpanTrait&lt;C, T&gt;</code></pre>

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## 2. Examples
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# Examples

```cairo
let mut ba: ByteArray = "1";
ba.append(@"2");
assert!(ba == "12");

Fully qualified path: core::byte_array::ByteArrayTrait::append

fn append(ref self: ByteArray, other: ByteArray)

These chunks are very bad for retrieval and contaminate the retrieval system