feature: support tooltip.appendToBody.

[100pah]

Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

support tooltip.appendToBody.
Based on the PR ecomfe/zrender#559 .

Fixed issues

Fix #8049.

Details

The changes from #8049:

• Add tooltip.appendToBody and by default false rather than "append to body" by default, otherwise bring a break change.
• Support the existing features when appended to body for example show tooltip by dispatchAction, and do not trigger globalout when entering it.
• Support positioning tooltip on document.body with CSS settings like margin, padding and even CSS transform.

Usage

Are there any API changes?

• The API has been changed.

option = {
    tooltip: {
        appendToBody: true, // new option
        ...
    }
}

Related test cases or examples to use the new APIs

test/tooltip-appendToBody.html