Move setClientLibToken to ServiceOptions.

[kolea2]

After discussion with @chingor13, moving this API to ServiceOptions to use more broadly.

[chingor13]

cc @dazuma

[codecov]

Codecov Report

Merging #5959 into spanner-jdbc will decrease coverage by 0.77%.
The diff coverage is 33.33%.

@@ Coverage Diff @@## spanner-jdbc #5959 +/- ##
==================================================
- Coverage 47.33% 46.56% -0.78% + Complexity 27091 25581 -1510 
==================================================
Files 2516 2516 Lines 273453 268014 -5439 Branches 31350 30337 -1013 ==================================================
- Hits 129442 124798 -4644 + Misses 134405 133763 -642 + Partials 9606 9453 -153

Impacted Files	Coverage Δ	Complexity Δ
...src/main/java/com/google/cloud/ServiceOptions.java	40.33% <33.33%> (+0.07%)	29 <0> (ø)	⬇️
...va/com/google/cloud/spanner/jdbc/FailedUpdate.java	0% <0%> (-86.37%)	0% <0%> (-2%)
...m/google/cloud/spanner/jdbc/ChecksumResultSet.java	37.73% <0%> (-52.21%)	4% <0%> (-4%)
...ava/com/google/cloud/spanner/jdbc/FailedQuery.java	0% <0%> (-37.04%)	0% <0%> (-1%)
...oogle/cloud/spanner/jdbc/RetriableBatchUpdate.java	0% <0%> (-35%)	0% <0%> (-1%)
...m/google/cloud/spanner/jdbc/FailedBatchUpdate.java	0% <0%> (-29.63%)	0% <0%> (-1%)
...oogle/cloud/spanner/jdbc/ReadWriteTransaction.java	52.54% <0%> (-27.12%)	36% <0%> (-15%)
...oogle/cloud/spanner/jdbc/SingleUseTransaction.java	68.18% <0%> (-18.7%)	34% <0%> (-5%)
...le/cloud/spanner/jdbc/JdbcSqlExceptionFactory.java	31.88% <0%> (-13.84%)	5% <0%> (-2%)
...com/google/cloud/spanner/jdbc/RetriableUpdate.java	80% <0%> (-10%)	3% <0%> (ø)
... and 852 more

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