Add links support

[baev]

We should create an annotation @Link(name, url, type)

• Name - optional, text for link displayed in the report
• Url - the url (or probably part of the url) for link
• Type - optional, used for link icon

Also you can use system properties for common parts of links:

allure.link.{type}.pattern = https://example.org/{}

Predefines for issue and tms:

• @Issue is the link with type issue
• @Tms is the link with type tms

Examples of usage:

@Link("https://example.org")
@Link(name = "My site", url = "https://example.org")
@Link(name = "My other site", url = "https://example.org", type = "hello")
@Link(name = "Yet another site", url = "id-123", type = "hello") // and system property `allure.link.hello.pattern: https://example.org/{}`
@Issue("SOME-123")
@Issue("https://example.org/SOME-123")
@Issue(name = "SOME-123", url = "https://example.org/SOME/123")
@Issue(name = "SOME-123", url = "SOME/123")  // and system property `allure.link.hello.pattern: https://example.org/{}`