enhance: better auto-detect of SVE options for the bitset library

[alexanderguzhva]

Enables the compilation of SVE code for the bitset library if a C++ compiler supports it.

There are two conditions for enabling the SVE code

• a C++ compiler needs to have a -march=armv8-a+sve
• arm_sve.h header must be available

AFAIK, gcc 7 does not support SVE, gcc 8 and gcc 9 support SVE, but have no arm_sve.h file, and only gcc 10 has both.

[sre-ci-robot]

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[mergify]

@alexanderguzhva

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.71%. Comparing base (1ced768) to head (4892fa6).

❌ Your project check has failed because the head coverage (73.71%) is below the target coverage (77.00%). You can increase the head coverage or adjust the target coverage.

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HEAD has 2 uploads less than BASE

Flag	BASE (1ced768)	HEAD (4892fa6)
	3	1

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #43833       +/-   ##
===========================================
- Coverage   79.33%   73.71%    -5.62%     
===========================================
  Files        1556      331     -1225     
  Lines      225160    32204   -192956     
===========================================
- Hits       178624    23740   -154884     
+ Misses      40074     8464    -31610     
+ Partials     6462        0     -6462     

Components	Coverage Δ
Client	∅ <ø> (∅)
Core	73.71% <ø> (-0.01%)	⬇️
Go	∅ <ø> (∅)

Files with missing lines	Coverage Δ
...ternal/core/src/bitset/detail/platform/dynamic.cpp	67.00% <ø> (ø)

... and 1228 files with indirect coverage changes

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[liliu-z]

Should we enlarge the scope?

[liliu-z]

Why we change the macro? I thought this __ARM_FEATURE_SVE will be auto-enabled once we set the flag during the compilation? Plz CMIIW