Declare tentative return types for ext/xmlwriter

Relates to GH-6995

Generate class entries from stubs for com, standard, xmlreader, xmlwriter, xsl, zip, Zend

Closes GH-6706

Verify parameter names of function aliases

Closes GH-6335

Remove return types from XMLWriter stubs

These break BC, and as such we have to stick with docblock annotations.

Closes GH-6319.

Update ext/xsl parameter names

Additionally normalize to using $namespace rather than $uri for
namespace parameters, including in XMLReader and XMLWriter. I went
with that one as it

Update ext/xsl parameter names

Additionally normalize to using $namespace rather than $uri for
namespace parameters, including in XMLReader and XMLWriter. I went
with that one as it is currently used by DOM, SimpleXML and XSL --
and our DOM parameter names follow the DOM specification.

Closes GH-6295.

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Improve parameter names in ext/xmlwriter

Closes GH-6202.

Update the default values of xmlwriter_write_dtd_entity()

Its default method handling had already been fixed not long ago, but only the stub of its method counterpart was updated.

Display string default values in stubs more uniformly

Settling on using quoted string

Fix UNKNOWN default values in various extensions

Closes GH-6075

Fix XMLWriter::writeDtdEntity() stub

$isparam is optional.

FR #79344: xmlwriter_write_attribute_ns: $prefix should be nullable

The `$prefix` parameter of `xmlwriter_write_element_ns()` and
`xmlwriter_start_element_ns()` is nullable, what allows

FR #79344: xmlwriter_write_attribute_ns: $prefix should be nullable

The `$prefix` parameter of `xmlwriter_write_element_ns()` and
`xmlwriter_start_element_ns()` is nullable, what allows these functions
to be used instead of their non NS variants. Consequently, we make the
`$prefix` parameter of `xmlwriter_write_attribute_ns()` and
`xmlwriter_start_attribute_ns()` nullable as well.

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Generate function entries from stubs for a couple of extensions

Migrates ext/standard, ext/tidy, ext/tokenizer,
ext/xml, ext/xml_reader, and ext/xml_writer. Closes GH-5381.