Add "Smart break line" feature to LSP

Visual Studio (not Code) has a great feature called "Smart break line" for C#. When you have code like this:

void M($$)

... pressing Shift + Enter turns it into this:

void M()
{
    $$
}

($$ represents cursor position)
Such feature can come in handy in a large variety of languages, so I think it should be added to LSP.

Possible use cases:
C++:

void main($$)

void main()
{
    $$
}

Python:

def main($$)

def main():
    $$

Html case 1:

<div$$>

<div>
    $$
</div>

Html case 2:

<div id="someId$$">

<div id="someId">
    $$
</div>

SQl (postgres dialect):

CREATE TABLE "MyTable$$"

CREATE TABLE "MyTable"
(
    $$
)

The issue names no repository files, tests, or entry points. Start by identifying where this LSP feature would be specified, then compare the C++, Python, HTML, and PostgreSQL examples; done would require an agreed protocol change that supports the requested behavior.