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new .redefine pragma for templates, warn on redefinition without it (#20211)

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* test CI for template redefinitions

* adapt asyncmacro

* fix quote

* fix again

* try something else

* revert

* fix ioselectors_select, disable packages CI

* adapt more tests & simplify

* more

* more

* more

* rename to redefine, warn on implicit redefinition

* basic documentation [skip ci]

* Update compiler/lineinfos.nim

Co-authored-by: konsumlamm <44230978+konsumlamm@users.noreply.github.com>

Co-authored-by: konsumlamm <44230978+konsumlamm@users.noreply.github.com>
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doc/manual.md
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@ -7050,6 +7050,22 @@ immediate pragma
The immediate pragma is obsolete. See `Typed vs untyped parameters
<#templates-typed-vs-untyped-parameters>`_.
redefine pragma
---------------
Redefinition of template symbols with the same signature is allowed.
This can be made explicit with the `redefine` pragma:
```nim
template foo: int = 1
echo foo() # 1
template foo: int {.redefine.} = 2
echo foo() # 2
# warning: implicit redefinition of template
template foo: int = 3
```
This is mostly intended for macro generated code.
compilation option pragmas
--------------------------