Changes and fixes for the new DELIFEQ command

[enjoy-binbin]

DELIFEQ was added in #1975 but had some issues.

Do some refactoring to reduce the number of lines of code,
write commands need to increment dirty and we can propagate
it as DEL command.

Changes:

1. Replicate as DEL is important for compatibility with replicas
   running an older Valkey version, also it can save the compare
   logic, like other commands like GETDEL.
2. Signal modified key is for WATCH and do invalidate client-side
   caching (client tracking)
3. Keyspace notifications.
4. Dirty++ indicates there are unsaved changes for RDB.
5. Using shared strings for the RESP zero and one replies for the
   code cleanup.
6. Add FAST command flag and remove the ACCESS key specs flag.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.05%. Comparing base (36b51c9) to head (ab2f507).

Additional details and impacted files

@@             Coverage Diff              @@
##           unstable    #2120      +/-   ##
============================================
- Coverage     71.19%   71.05%   -0.14%     
============================================
  Files           122      122              
  Lines         66046    66045       -1     
============================================
- Hits          47020    46930      -90     
- Misses        19026    19115      +89     

Files with missing lines	Coverage Δ
src/commands.def	100.00% <ø> (ø)
src/t_string.c	96.83% <100.00%> (+0.36%)	⬆️

... and 17 files with indirect coverage changes

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