Add more specific array return type hints for various extensions - part 1

ext/bz2, ext/calendar, ext/dba, ext/enchant

Closes GH-7432

Promote incorrect bzerr stream type to TypeError

This restores the signature we originally promised for PHP-8.0,
without the spurious false return type.

Fix stubs for bzerr* functions

These can return false if the stream is not a bz2 stream. Also
emit a warning in this case, this should not be failing silently.

Implicitly enable function entry generation when class entry generation is enabled

Closes GH-6675

Generate class entries for a few extensions

Relates to GH-6644

gen_stub: Also verify implementation-alias

This makes --verify also check @implementation-alias. Failures are
ignored using @no-verify instead. Some mistakes have been made that
woul

gen_stub: Also verify implementation-alias

This makes --verify also check @implementation-alias. Failures are
ignored using @no-verify instead. Some mistakes have been made that
would have been caught by this...

Closes GH-6615.

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Verify parameter names of function aliases

Closes GH-6335

Make $use_less_memory a boolean parameter

Update ext/bz2 parameter names

Closes GH-6280.

Update ext/sockets parameter names

Also change $max_length to $length in a number of filesystem APIs,
where our usage was inconsistent.

Closes GH-6276.

Review parameter names in ext/zlib

Closes GH-6250

Fix UNKNOWN default values in ext/standard

Closes GH-6026

Improve gen_stub.php

Closes GH-5350
Add support for generating deprecated function entries, as well as forward declaration
of function aliases.

Annotate function aliases in stubs

Add stubs for aliases

Closes GH-5187

Add union return types for function stubs

Creating stub for ext bz2