feat: add new ruleset grammar

[iorate]

This pull request introduces a new grammar of ruleset.

---
name: New grammar example
description: YAML frontmatter is supported.
---

########## String matchers ##########

# Titles which are exactly "Example Domain"
title = "Example Domain"

# Titles which start with "Example"
title ^= "Example"

# Titles which end with "domain", case-insensitive
title $= "domain" i

# Titles which include "ple dom", case-insensitive
title *= "ple dom" i

########## Regular expressions ##########

# URLs which include "example.net" or "example.org"
url =~ /example\.(net|org)/

# "=~" can be omitted
url/example\.(net|org)/

# "url" can be omitted
/example\.(net|org)/

# Titles which include "example domain", case-insensitive
title =~ /example domain/i

########## Logical operators ##########

# Block schemes other than HTTPS
!scheme="https"

# Block Amazon.com on Google
$site = "google" & host = "www.amazon.com"

# Titles including "example" or "domain", case-insensitive
title *= "example" i | title *= "domain" i

########## With match patterns ##########

# Block Amazon.com on image search
*://*.amazon.com/* @if($category="images")

The extension reads the name field in YAML frontmatter. #351 can be closed.

---
name: Your ruleset name
---
*://*.example.com/*
/example\.(net|org)/
title =~ /example domain/i

#422 can also be closed.

*://*.amazon.com/* @if($site="google" & $category="images")

[aug-dev]

The legend!

[github-actions]

🎉 This PR is included in version 8.8.0 🎉

The release is available on:

• Chrome Web Store
• Firefox Add-ons
• GitHub release

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