Set all parameters to ldap_sasl_bind as NULL by default

For mech, realm, authcid, authzid and props NULL means do not change
current server setting.

Default bind dn and password to NULL in ldap_bind_ext

Default bind dn and password to NULL in ldap_bind

Make URI parameter in ldap_connect default to NULL

Display string default values in stubs more uniformly

Settling on using quoted string

Use ZPP instead of custom type checks

We can add these types as a native type declaration to stubs as a side-effect. Closes GH-6068

Add another round of missing parameter types to stubs

Closes GH-5950

Add a bunch of missing argument types to stubs

Convert the $ttl parameter of ldap_exop_refresh() to int

Add ldap_count_references()

Closes GH-5784

Promote warning to exception in ldap_set_rebind_proc()

From now on, ldap_set_rebind_proc() will only accept callable or null
as argument 2.

Closes GH-5763

Fix [-Wundef] warnings in LDAP extension

Drop check for HAVE_NSLDAP

This constant is never defined thus useless

Fix nullable types in PHPDoc

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

Revert "Replace @param annotations with type declarations"

This reverts commit c31029f335ca1b453af799805c43c37e959ad555.

Replace @param annotations with type declarations

Add union return types for function stubs

Adding ldap stubs for arginfo