plan: handle DNF expressions in Selectivity

[eurekaka]

What problem does this PR solve?

Fix #8921

What is changed and how it works?

Consider DNF expressions when extracting ranges for estimation in Selectivity.

Check List

Tests

• Integration test

Code changes

N/A

Side effects

N/A

Related changes

N/A

[codecov-io]

Codecov Report

Merging #9282 into master will increase coverage by 0.01%.
The diff coverage is 74.6%.

@@            Coverage Diff             @@
##           master    #9282      +/-   ##
==========================================
+ Coverage   67.22%   67.24%   +0.01%     
==========================================
  Files         371      371              
  Lines       77271    77299      +28     
==========================================
+ Hits        51949    51978      +29     
- Misses      20682    20685       +3     
+ Partials     4640     4636       -4

Impacted Files	Coverage Δ
planner/core/common_plans.go	59.9% <33.33%> (-1.08%)	⬇️
planner/core/exhaust_physical_plans.go	94.08% <50%> (ø)	⬆️
planner/core/logical_plans.go	72.58% <71.42%> (+0.33%)	⬆️
statistics/selectivity.go	56.59% <81.25%> (+1.1%)	⬆️
util/ranger/detacher.go	81.19% <83.33%> (-2.68%)	⬇️
infoschema/infoschema.go	76.31% <0%> (-1.32%)	⬇️
expression/schema.go	93.75% <0%> (-0.79%)	⬇️
store/tikv/region_cache.go	83.33% <0%> (-0.58%)	⬇️
executor/index_lookup_join.go	77.91% <0%> (+0.63%)	⬆️
... and 3 more

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[eurekaka]

/run-all-tests

[eurekaka]

/run-all-tests

[alivxxx]

LGTM

[zz-jason]

LGTM

[zz-jason]

@eurekaka We'd better to cherry pick this commit to release 2.1.