[Public API Reform] Split $election->getResult methods, for filtering by tags

[julien-boudry]

Context

Filtering by tags uses the methodOption argument, which is not consistent and complex.
Also, the option keys are ugly, especially in this context.

Proposal

Create getResultWithTagsand getResultWithoutTags, it's more intelligible and more consistent with similar methods.

Breaking changes

(high) Filtering by tags using getResult is no longer supported.