feat: migrate to java microgenerator

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PiperOrigin-RevId: 356341083
Source-Link: googleapis/googleapis@8d8c008
PiperOrigin-RevId: 351852297
Source-Link: googleapis/googleapis@df49bfe
PiperOrigin-RevId: 350949863
Source-Link: googleapis/googleapis@91e206b
PiperOrigin-RevId: 346894665
Source-Link: googleapis/googleapis@cbbd317
PiperOrigin-RevId: 346372957
Source-Link: googleapis/googleapis@857f70d
PiperOrigin-RevId: 346126713
Source-Link: googleapis/googleapis@b8b2f8c
PiperOrigin-RevId: 346117305
Source-Link: googleapis/googleapis@93519d5

[codecov]

Codecov Report

Merging #629 (6944bcc) into master (abfcbc3) will increase coverage by 1.75%.
The diff coverage is 87.12%.

@@             Coverage Diff              @@
##             master     #629      +/-   ##
============================================
+ Coverage     81.77%   83.52%   +1.75%     
- Complexity     1156     1198      +42     
============================================
  Files           110      110              
  Lines          7214     7309      +95     
  Branches        377      383       +6     
============================================
+ Hits           5899     6105     +206     
+ Misses         1117     1005     -112     
- Partials        198      199       +1     

Impacted Files	Coverage Δ	Complexity Δ
...able/admin/v2/BaseBigtableInstanceAdminClient.java	85.50% <ø> (+24.04%)	73.00 <0.00> (+17.00)
...igtable/admin/v2/BaseBigtableTableAdminClient.java	88.37% <ø> (+25.46%)	90.00 <0.00> (+23.00)
...table/admin/v2/stub/BigtableInstanceAdminStub.java	3.70% <0.00%> (-0.15%)	1.00 <0.00> (ø)
...bigtable/admin/v2/stub/BigtableTableAdminStub.java	3.22% <0.00%> (ø)	1.00 <0.00> (ø)
...ogle/cloud/bigtable/data/v2/stub/BigtableStub.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...able/data/v2/stub/GrpcBigtableCallableFactory.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
.../cloud/bigtable/data/v2/stub/GrpcBigtableStub.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...table/admin/v2/BaseBigtableTableAdminSettings.java	8.75% <10.00%> (ø)	2.00 <0.00> (ø)
...le/admin/v2/BaseBigtableInstanceAdminSettings.java	9.21% <50.00%> (ø)	2.00 <0.00> (ø)
...ud/bigtable/data/v2/stub/BigtableStubSettings.java	76.57% <76.66%> (+2.04%)	7.00 <0.00> (ø)
... and 9 more

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to be reviewed