Fix a few more classsynopsis generation issues

Closes GH-7480

Declare tentative return types for Zend (#7251)

Co-authored-by: Nikita Popov <nikita.ppv@gmail.com>

Make some exception properties typed

Closes GH-6891

Get rid of private final methods (#6892)

Remove a few more unnecessary @generate-function-entries annotations

Add support for generating class entries from stubs

Closes GH-6289

Co-authored-by: Nikita Popov <nikita.ppv@gmail.com>

Require stubs to declare return types for magic methods when possible

Closes GH-6376

Improve default value handling of Exception constructors

Closes GH-6166

Add support for `@implementation-alias` in stubs

Closes GH-6170

Ensure Exception::getFile/getLine return type is correct

These return an untyped protected property, so we can't rely on
the type being correct.

Also add return types to the int

Ensure Exception::getFile/getLine return type is correct

These return an untyped protected property, so we can't rely on
the type being correct.

Also add return types to the interface -- normally this would be
a no-go, but Throwable is a special interface that can only
be implemented internally, so we control all implementations.

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Generate method entries from stubs for Zend classes

Closes GH-5459

Add missing visibility modifiers in stubs

Verify that all stubs have a return type

Define Stringable with __toString():string method

Add Zend class/interface arginfo stubs

We also change `Generator::throw()` to expect a `Throwable` in the
first place, and we now throw a TypeError instead of returning `false`
from

Add Zend class/interface arginfo stubs

We also change `Generator::throw()` to expect a `Throwable` in the
first place, and we now throw a TypeError instead of returning `false`
from `Exception::getTraceAsString()`.

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