feat(tooltip): add `appendTo` option to allow customizing tooltip container (#18436)

* feat: allow customed tooltip container

* refactor: rename variables: getAppendElement => teleport & customContainer => container

* feat: support 3 options to locale the tooltip container

* refactor: rename customContainer to container

* fix: add model params name

* refactor: rename variables: getAppendElement => teleport & customContainer => container

* refactor: update based on cr

* fix: add missing variable

* test: add test case for appendTo

* fix: add fallback

* fix: only update styled to position:relative when there is no custom container

* refactor: rename element name

* fix: clearing the _container & el in the dispose function

* fix: chartContainer always exists

* test: tweak test case

* chore: tweak comment

* fix(tooltip): fix potential exception when `appendTo` is an empty string

* fix(tooltip): fix potential exception when `appendTo` is an empty string or null

---------

Co-authored-by: 危翰 <weihan@xiaomi.com>
Co-authored-by: plainheart <yhen@all-my-life.cn>