No consistancy style enforced in [code]

We use `template class backend_traits {` and `template` aka `SpaceAfterTemplateKeyword` in clang format

```
applenco@aurora-uan-0012:~/SYCL-Docs> rg "template<" | wc -l
418
applenco@aurora-uan-0012:~/SYCL-Docs> rg "template <" | wc -l
463
```

Also, sometimes function arguments are in their own line, sometime we try to fill everything up to 80 chars and split, sometimes one per line (named `BinPackParameters` in clang-format)

```
template
explicit queue(const context& syclContext,
const DeviceSelector& deviceSelector,
const property_list& propList = {});
```

```
template
T atomic_fetch_xor(atomic object, T operand,
memory_order memoryOrder = memory_order::relaxed);
```

```
exception(context ctx, std::error_code ec, const std::string& what_arg);
```

I don't really care; we should just be consistent. I have a script that can reformat everything. We should just pick the correct option for clang-format.

Then, we ran rust clang-format in the CI and live happily long after.

Start by using the reported rg searches to measure the inconsistent template spacing and review the shown function-argument layouts. Choose the clang-format options for template spacing and parameter packing, apply the existing reformatting script, and verify that clang-format runs successfully in CI.

Written by the indexing model from the issue text.