feat: get_record_by_name and get_projection_by_name helpers

[helen-m-lin]

closes #210

This PR adds get_record_by_name and get_projection_by_name helper methods following the format of the existing "get by id" helpers.

[jtyoung84]

Can these be made class methods on the client instead of adding them to the helpers class? Also, it seems like they can be combined into one function by making the projection an optional dict with default None.

[helen-m-lin]

I followed the format of the existing get_record_by_id and get_projection_by_id methods. Should I update those as well? These would be breaking changes.

[tmchartrand]

I like the idea of combining with an optional arg, and don't expect breaking changes will be a big issue here.

@jtyoung84 are you suggesting moving everything in this helpers.docdb module to client class methods? I don't have a strong preference either way but it would be a bit odd to move some and not all.

[tmchartrand]

I guess one reason not to would be if we were open to eventually adding the option of returning validated Pydantic objects as I suggested in the issue - then I assume we'd want to keep the aind-data-schema dependency isolated to the helpers module.

[jtyoung84]

I reckon we can leave this as is. We can refactor things in the next major release.