More search options for Mercari route

[antermin]

What feature is it?

Support more search options, such as Price (range), Keywords to exclude, Brand and Category.

What problem does this feature solve?

When searching on Mercari Japan, there are other search options (Price (range), Keywords to exclude, Brand, Category, etc.) which can be used to refine the results.

However, the Mercari route in RSSHub only supports the basic options (Keyword, Status, Order, Sort).

Additional description

No response

This is not a duplicated feature request or new RSS proposal

• [x] I have searched existing issues to ensure this feature has not already been requested and this is not a new RSS proposal.