Add more specific array return type hints for various extensions - part 6 (#7474)

Not serializable flag permeation

Generate class entries for snmp, soap, sockets, sodium, sqlite3, sysv*, tidy

Closes GH-6696

socket_create_pair() can no longer return NULL

Closes GH-6592.

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.

Display types in stubs more uniformly

In preparation for generating method signatures for the manual.

This change gets rid of bogus false|null return types, a few unnecessary traili

Display types in stubs more uniformly

In preparation for generating method signatures for the manual.

This change gets rid of bogus false|null return types, a few unnecessary trailing backslashes, and settles on using ? when possible for nullable types.

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Fix UNKNOWN default values in various extensions

Closes GH-6075

Add more argument types to stubs

Closes GH-5943

Convert resources to objects in ext/sockets

Closes GH-5900.

Use UNKNOWN default for socket_connect()

Specifying the port is mandatory for INET sockets.

Fix socket_write() default value

Generate function entries for another batch of extensions

Closes GH-5352

Annotate function aliases in stubs

Verify that all stubs have a return type

Add stubs for aliases

Closes GH-5187

Add union return types for function stubs

Add stubs for ext-sockets