Partially addresses #937, for the PECL package manager.

What I did

I've added rule DL3062 for pinning PECL packages.

How I did it

I've copied and edited the DL3016 rule, which does the same for NPM packages.

How to verify it

Instructions like these should produce a rule violation:

pecl install redis
pecl install redis-6.1.0 xdebug
pecl install pecl.php.net/redis

To Do

• Add the spec;
• Confirm all the allowed variants for the PECL channel definitions;
• Update the docs;
• Confirm the rule is working, as I have no local setup for the project yet.