feat(script): add support for 'mavenId()' in 'class'

[tangcent]

implement: #1153
example:

method.doc=groovy:```
"maven:\n```xml\n"+ it.containingClass().mavenId().maven() + "\n```"
```

[codecov]

Codecov Report

Attention: Patch coverage is 92.06349% with 5 lines in your changes missing coverage. Please review.

Project coverage is 62.756%. Comparing base (5fddde4) to head (444d24b).

Files	Patch %	Lines
...ain/kotlin/com/itangcent/idea/utils/MavenHelper.kt	94.828%	1 Missing and 2 partials ⚠️
...com/itangcent/idea/plugin/rule/ScriptRuleParser.kt	60.000%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##              master     #1155       +/-   ##
===============================================
+ Coverage     62.625%   62.756%   +0.131%     
- Complexity      2367      2374        +7     
===============================================
  Files            254       255        +1     
  Lines          12265     12335       +70     
  Branches        3016      3030       +14     
===============================================
+ Hits            7681      7741       +60     
- Misses          3003      3009        +6     
- Partials        1581      1585        +4     

Flag	Coverage Δ
unittests	62.756% <92.063%> (+0.131%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...com/itangcent/idea/plugin/rule/ScriptRuleParser.kt	52.927% <60.000%> (+0.084%)	⬆️
...ain/kotlin/com/itangcent/idea/utils/MavenHelper.kt	94.828% <94.828%> (ø)

... and 11 files with indirect coverage changes

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 5fddde4...444d24b. Read the comment docs.