feat: Update spark connector pom.xml

[jiangmichaellll]

1. use auto service instead of auto service annotation in the processor. https://screenshot.googleplex.com/AZCi8QjvdQ9AdC2
2. Add relocations to resolve grpc-netty-shaded issues.

[codecov]

Codecov Report

Merging #445 (a4ed1a6) into master (5190989) will decrease coverage by 0.23%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #445      +/-   ##
============================================
- Coverage     71.32%   71.08%   -0.24%     
  Complexity      913      913              
============================================
  Files           167      167              
  Lines          4812     4831      +19     
  Branches        244      244              
============================================
+ Hits           3432     3434       +2     
- Misses         1241     1257      +16     
- Partials        139      140       +1     

Impacted Files	Coverage Δ	Complexity Δ
...le/cloud/pubsublite/spark/PslContinuousReader.java	54.05% <0.00%> (-0.24%)	8.00% <0.00%> (ø%)
...m/google/cloud/pubsublite/spark/PslDataSource.java	0.00% <0.00%> (ø)	0.00% <0.00%> (ø%)
...loud/pubsublite/internal/wire/RoutingMetadata.java	0.00% <0.00%> (ø)	0.00% <0.00%> (ø%)
.../pubsublite/spark/PslContinuousInputPartition.java	0.00% <0.00%> (ø)	0.00% <0.00%> (ø%)
...ogle/cloud/pubsublite/internal/ServiceClients.java
...cloud/pubsublite/internal/wire/ServiceClients.java	0.00% <0.00%> (ø)	0.00% <0.00%> (?%)
...oud/pubsublite/internal/wire/PublisherBuilder.java	68.75% <0.00%> (+6.48%)	3.00% <0.00%> (ø%)
...ud/pubsublite/internal/wire/SubscriberBuilder.java	47.82% <0.00%> (+7.08%)	2.00% <0.00%> (ø%)
...le/cloud/pubsublite/spark/PslMicroBatchReader.java	77.50% <0.00%> (+7.73%)	12.00% <0.00%> (ø%)

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[jiangmichaellll]

I am going to try another suggestion from dataproc team. This PR makes it working in dataproc but restrains the fat jar with specific versions of tcnative that might not work with other images.

EDIT: the grpc netty shaded relocation works like a charm!