PHPCSStandards / PHP_CodeSniffer / 13902484955

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Ruleset: handle invalid sniffs more graciously

As things were, a ruleset loading an invalid sniff - a sniff which doesn't implement the `Sniff` interface and is missing either the `register()` or `process()` method, or both -, would result in fatal errors which are unfriendly to the end-user.

Now, while this will hopefully be a very rare occurrence and should no longer be possible as of PHPCS 4.0, which intends to remove support for sniffs not implementing the `Sniff` interface, I still believe it prudent to show more user-friendly and more informative error messages to the end-user until that time.

This commit implements this and executes step 2 to address issue 694..

Includes tests.

Output of commands involving various invalid sniffs **before** this PR:

```
$ phpcs -ps . --standard=./tests/Core/Ruleset/RegisterSniffsRejectsInvalidSniffNoImplementsNoRegisterTest.xml

Fatal error: Uncaught Error: Call to undefined method TestStandard\Sniffs\InvalidSniffError\NoImplementsNoRegisterSniff::register() in path/to/PHP_CodeSniffer/src/Ruleset.php:1505
Stack trace:
  thrown in path/to/PHP_CodeSniffer/src/Ruleset.php on line 1505
```

```
$ phpcs -ps . --standard=./tests/Core/Ruleset/RegisterSniffsRejectsInvalidSniffNoImplementsNoProcessTest.xml

PHP_CodeSniffer version 3.11.1 (stable) by Squiz and PHPCSStandards

Fatal error: Uncaught Error: Call to undefined method TestStandard\Sniffs\InvalidSniffError\NoImplementsNoProcessSniff::process() in path/to/PHP_CodeSniffer/src/Files/File.php:519
Stack trace:
  thrown in path/to/PHP_CodeSniffer/src/Files/File.php on line 519
```

```
$ phpcs -ps . --standard=./tests/Core/Ruleset/RegisterSniffsRejectsInvalidSniffNoImplementsNoRegisterOrProcessTest.xml

PHP_CodeSniffer version 3.11.1 (stable) by Squiz and PHPCSStandards

Fatal error: Uncaught Error: Call to undefined method TestStandard\Sniffs\InvalidSniffError\NoImplementsNoRegisterOrProcessSniff::register() in path/to/PHP_CodeSniffer/src/Ruleset.php:1505
Stack... (continued)

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19303 of 24892 relevant lines covered (77.55%)

76.75 hits per line