Matcher support for Span as well as Doc

[paoloq]

Description

Matcher support for searching on a Span, as well as a Doc. Fixes #5056
Missing of an appropriate error message at line 228 in matcher.pxy

Types of change

Enhancement/feature for the Matcher.

Checklist

• I have submitted the spaCy Contributor Agreement.
• I ran the tests, and all new and existing tests passed.
• My changes don't require a change to the documentation, or if they do, I've added all required information.

[explosion-bot]

Hi @paoloq, thanks for your pull request! 👍 It looks like you haven't filled in the spaCy Contributor Agreement (SCA) yet. The agreement ensures that we can use your contribution across the project. Once you've filled in the template, put it in the .github/contributors directory and add it to this pull request. If your pull request targets a branch that's not master, for example develop, make sure to submit the Contributor Agreement to the master branch. Thanks a lot!

If you've already included the Contributor Agreement in your pull request above, you can ignore this message.

[svlandeg]

Hi @paoloq : apologies for the late follow-up. Could you merge the latest version of master into this branch and resolve the conflicts? Your contributor agreement is there now twice, and a different PR made some edits to test_matcher_api: just need to make sure that both PRs are kept intact.

Let me know if you need help merging!

[svlandeg]

Thanks a lot for your contribution! It's now merged, and will be included in the next release of spaCy, probably 2.3 (or otherwise 3.0) 👍