Improve the CRUD performance of LU sections

[Danieladu]

Fixes: #888
Improve the performance for adding/updating/deleting/inserting section into LUResource.

What this pr did:

1. Replace parseTree with "range" in section
2. Only parse corresponding lu content to avoid the whole file parsing
3. Adjust section and error range

what will do

• Pass all tests
• Provide performance-enhancing data reports

what should be discussed

Currently, LU has no static checker. So, if someone updates a section, the diagnostic of the original section should be removed.
The issue is, it is hard to locate the original errors, for many of them do not contain the range info.
Welcome to propose a solution.

performance improvement

	Before	After
Parse whole file	600ms	600ms
CRUD time	400ms(With builtin cache)	5ms

[codecov-commenter]

Codecov Report

Merging #901 into master will increase coverage by 0.20%.
The diff coverage is 92.39%.

@@            Coverage Diff             @@
##           master     #901      +/-   ##
==========================================
+ Coverage   57.25%   57.45%   +0.20%     
==========================================
  Files         218      220       +2     
  Lines       16237    16269      +32     
  Branches     2251     2241      -10     
==========================================
+ Hits         9296     9347      +51     
+ Misses       6362     6352      -10     
+ Partials      579      570       -9     

Impacted Files	Coverage Δ
packages/lu/src/parser/lufile/baseSection.js	58.33% <58.33%> (ø)
packages/lu/src/parser/lufile/sectionOperator.js	86.84% <88.05%> (-3.41%)	⬇️
packages/lu/src/parser/lufile/diagnostic.js	100.00% <100.00%> (ø)
packages/lu/src/parser/lufile/entitySection.js	97.50% <100.00%> (+0.35%)	⬆️
packages/lu/src/parser/lufile/importSection.js	100.00% <100.00%> (ø)
packages/lu/src/parser/lufile/luParser.js	91.39% <100.00%> (-0.13%)	⬇️
packages/lu/src/parser/lufile/luResource.js	100.00% <100.00%> (ø)
packages/lu/src/parser/lufile/modelInfoSection.js	100.00% <100.00%> (ø)
...ckages/lu/src/parser/lufile/nestedIntentSection.js	94.44% <100.00%> (+1.11%)	⬆️
packages/lu/src/parser/lufile/newEntitySection.js	92.45% <100.00%> (+0.96%)	⬆️
... and 36 more

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[feich-ms]

@lei9444 please verify the functionality and efficiency of this improvments in composer side.