dialect: (riscv) Custom syntax for DirectiveOp

[kingiler]

Custom syntax has been added for DirectiveOp.

New custom syntax will be as follows:

riscv.directive ".align" "2" : () -> ()

Notice the absence of comma between directive and value.

[codecov]

Codecov Report

Patch coverage: 90.90% and no project coverage change.

Comparison is base (77d5f57) 90.03% compared to head (3fe641f) 90.03%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1432   +/-   ##
=======================================
  Coverage   90.03%   90.03%           
=======================================
  Files         214      214           
  Lines       26553    26597   +44     
  Branches     3951     3959    +8     
=======================================
+ Hits        23906    23946   +40     
- Misses       2018     2020    +2     
- Partials      629      631    +2     

Files Changed	Coverage Δ
xdsl/dialects/riscv.py	86.52% <90.90%> (+0.18%)	⬆️

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