Following #43714, which moved the element interfaces into the `element/`
directory and extracted `get_int_attribute` into `attributes.rs` as a
proof-of-concept, this PR moves the remaining attribute getter/setter
methods out of `element.rs` into the separate `attributes.rs` file.
The following methods were moved:
- `set_atomic_attribute`
- `set_bool_attribute`
- `get_url_attribute` / `set_url_attribute`
- `get_trusted_type_url_attribute`
- `get_trusted_html_attribute`
- `get_string_attribute` / `set_string_attribute`
- `get_nullable_string_attribute` / `set_nullable_string_attribute`
- `get_tokenlist_attribute` / `set_tokenlist_attribute`
- `set_atomic_tokenlist_attribute`
- `set_int_attribute`
- `get_uint_attribute` / `set_uint_attribute`
This reduces the size of `element.rs` and groups all attribute-related
helper methods together in one place.
Testing:
No tests required as this is a pure code move with no behavioural
changes. The existing test suite covers the moved methods indirectly
through their callers. `cargo check` passes cleanly.
part of #38901
part of #43709
part of #43714
Signed-off-by: CynthiaOketch <cynthiaoketch6@gmail.com>
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