Deprecate implicit dynamic properties

Writing to a proprety that hasn't been declared is deprecated,
unless the class uses the #[AllowDynamicProperties] attribute or
defines __get()/

Deprecate implicit dynamic properties

Writing to a proprety that hasn't been declared is deprecated,
unless the class uses the #[AllowDynamicProperties] attribute or
defines __get()/__set().

RFC: https://wiki.php.net/rfc/deprecate_dynamic_properties

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Fix json_encode regression with JSON_PRETTY_PRINT

This makes the json encoding behavior the same as it was prior to the memory
optimizations added in f9f8c1c79cac1b03279190e0c5513a518816

Fix json_encode regression with JSON_PRETTY_PRINT

This makes the json encoding behavior the same as it was prior to the memory
optimizations added in f9f8c1c79cac1b03279190e0c5513a51881615f9
(for objects with declared properties)

This is based on the code for the unoptimized case below the changes.

Buggy output prior to this commit:
```
{
"prop":"value"}
```

Correct output:

```
{
"prop": "value"
}
```

Closes GH-6811

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