optimize:Expose some keepalive-related configuration for Druid, Hikari, and DBCP

[xingfudeshi]

• I have registered the PR changes.

Ⅰ. Describe what this PR did

Expose some keepalive-related configuration for Druid, Hikari, and DBCP to allow users to customize database connection pool settings.

Ⅱ. Does this pull request fix one issue?

Fixes #6600

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov]

Codecov Report

Attention: Patch coverage is 54.54545% with 40 lines in your changes missing coverage. Please review.

Project coverage is 52.98%. Comparing base (0c361b7) to head (222be90).

Files with missing lines	Patch %	Lines
...igure/properties/server/store/DruidProperties.java	50.00%	11 Missing ⚠️
...figure/properties/server/store/DbcpProperties.java	50.00%	9 Missing ⚠️
...gure/properties/server/store/HikariProperties.java	50.00%	9 Missing ⚠️
...e/seata/server/store/HikariDataSourceProvider.java	55.55%	0 Missing and 4 partials ⚠️
...configure/SeataServerEnvironmentPostProcessor.java	0.00%	3 Missing ⚠️
...che/seata/server/store/DbcpDataSourceProvider.java	75.00%	0 Missing and 2 partials ⚠️
...he/seata/server/store/DruidDataSourceProvider.java	80.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x    #7130      +/-   ##
============================================
- Coverage     52.99%   52.98%   -0.01%     
- Complexity     6822     6838      +16     
============================================
  Files          1145     1148       +3     
  Lines         40559    40641      +82     
  Branches       4737     4745       +8     
============================================
+ Hits          21494    21534      +40     
- Misses        17017    17050      +33     
- Partials       2048     2057       +9     

Files with missing lines	Coverage Δ
...ava/org/apache/seata/common/ConfigurationKeys.java	0.00% <ø> (ø)
...in/java/org/apache/seata/common/DefaultValues.java	0.00% <ø> (ø)
...ta/spring/boot/autoconfigure/StarterConstants.java	100.00% <ø> (ø)
...che/seata/server/store/DbcpDataSourceProvider.java	92.00% <75.00%> (-8.00%)	⬇️
...he/seata/server/store/DruidDataSourceProvider.java	92.85% <80.00%> (-7.15%)	⬇️
...configure/SeataServerEnvironmentPostProcessor.java	0.00% <0.00%> (ø)
...e/seata/server/store/HikariDataSourceProvider.java	87.87% <55.55%> (-12.13%)	⬇️
...figure/properties/server/store/DbcpProperties.java	50.00% <50.00%> (ø)
...gure/properties/server/store/HikariProperties.java	50.00% <50.00%> (ø)
...igure/properties/server/store/DruidProperties.java	50.00% <50.00%> (ø)

... and 1 file with indirect coverage changes