dialect: (riscv) Custom syntax for CSR immediate Op

[kingiler]

Custom syntax has been added for CSR immediate operations.

New custom syntax will be as follows:

%csrrsi_rw = riscv.csrrsi 1024, 8 : () -> !riscv.reg<>
%csrrsi_r = riscv.csrrsi 1024, 0 : () -> !riscv.reg<>
%csrrci_rw = riscv.csrrci 1024, 8 : () -> !riscv.reg<>
%csrrci_r = riscv.csrrci 1024, 0 : () -> !riscv.reg<>
%csrrwi_rw = riscv.csrrwi 1024, 1 : () -> !riscv.reg<>
%csrrwi_w = riscv.csrrwi 1024, 1, "w" : () -> !riscv.reg<>

[codecov]

Codecov Report

Patch coverage: 93.75% and no project coverage change.

Comparison is base (17f0cc9) 90.03% compared to head (71ea42d) 90.04%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1435   +/-   ##
=======================================
  Coverage   90.03%   90.04%           
=======================================
  Files         214      214           
  Lines       26615    26647   +32     
  Branches     3959     3962    +3     
=======================================
+ Hits        23964    23994   +30     
- Misses       2020     2021    +1     
- Partials      631      632    +1     

Files Changed	Coverage Δ
xdsl/dialects/riscv.py	86.93% <93.75%> (+0.19%)	⬆️

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