feat(ai): Allow . in tag names

[saep]

Before this change, if you were to press cit while inside the tag.with.dot
tag somewhere inside the properties tag in the example below, it would delete
all other tags and leave an empty properties tag.

Example:

<properties>
  <a>tag is deleted</a>
  <tag.with.dot>I only want to change this</tag.with.dot>
</properties>

Before this change:

<properties></properties>

Before this change:

<properties>
  <a>tag is deleted</a>
  <tag.with.dot></tag.with.dot>
</properties>

[echasnovski]

Thanks for the PR!

This discussed in several issues: #314, #474. They also contain more feature-rich implementations.

The current behavior is intentional, in part to limit the use of Lua pattern based "tag" textobject in cases where it can be set up via tree-sitter.

Closing as not planned.