Implement all=TRUE argument for rleid (#1963)

[ayushmaanyd]

#1963

This PR adds the all argument to rleid and rleidv.

• When all = TRUE, the function returns a list containing the original input vectors alongside the generated IDs.
• original compatibility is maintained (default is all = FALSE).

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 99.03%. Comparing base (be67a4d) to head (5a4e09f).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
R/data.table.R	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7491      +/-   ##
==========================================
- Coverage   99.04%   99.03%   -0.01%     
==========================================
  Files          87       87              
  Lines       16671    16673       +2     
==========================================
+ Hits        16511    16512       +1     
- Misses        160      161       +1     

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