.forbids pragma: defining forbidden tags (#20050)

* .forbids pragma: defining illegal effects for proc types

This patch intends to define the opposite of the .tags pragma: a way to define effects which are not allowed in a proc.

* updated documentation and changelogs for the forbids pragma

* renamed notTagEffects to forbiddenEffects

* corrected issues of forbids pragma

the forbids pragma didn't handle simple restrictions properly and it also had issues with subtyping

* removed incorrect character from changelog

* added test to cover the interaction of methods and the forbids pragma

* covering the interaction of the tags and forbids pragmas

* updated manual about the forbids pragma

* removed useless statement

* corrected the subtyping of proc types using the forbids pragma

* updated manual for the forbids pragma

* updated documentations for forbids pragma

* updated nim docs

* updated docs with rsttester.nim

* regenerated documentation

* updated rst docs

* Update changelog.md

Co-authored-by: ringabout <43030857+ringabout@users.noreply.github.com>

* updated changelog

* corrected typo

Co-authored-by: ringabout <43030857+ringabout@users.noreply.github.com>
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@ -67,6 +67,8 @@ becomes an alias for `addr`.
## Language changes
- [Tag tracking](manual.html#tag-tracking) supports the definition of forbidden tags by the `.forbids` pragma
which can be used to disable certain effects in proc types.
- [Case statement macros](manual.html#macros-case-statement-macros) are no longer experimental,
meaning you no longer need to enable the experimental switch `caseStmtMacros` to use them.
- Templates now accept [macro pragmas](https://nim-lang.github.io/Nim/manual.html#userminusdefined-pragmas-macro-pragmas).