cleanup: use common's PaginationRange

[devjgm]

Deletes our own internal/range_from_pagination.h
Fixes: #1256

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This change is 

[codecov]

Codecov Report

Merging #1278 into master will increase coverage by 0.05%.
The diff coverage is n/a.

@@ Coverage Diff @@ ## master #1278 +/- ## ========================================== + Coverage 94.58% 94.63% +0.05%  ========================================== Files 178 177 -1 Lines 13851 13795 -56 ========================================== - Hits 13101 13055 -46  + Misses 750 740 -10

Impacted Files	Coverage Δ
...ud/spanner/integration_tests/client_stress_test.cc	82.45% <0%> (-0.88%)	⬇️
google/cloud/spanner/internal/session.h	100% <0%> (ø)	⬆️
google/cloud/spanner/internal/transaction_impl.h	100% <0%> (ø)	⬆️
google/cloud/spanner/connection_options.h	100% <0%> (ø)	⬆️
...cloud/spanner/internal/partial_result_set_resume.h	100% <0%> (ø)	⬆️
google/cloud/spanner/session_pool_options.h	100% <0%> (ø)	⬆️
google/cloud/spanner/transaction.h	100% <0%> (ø)	⬆️
google/cloud/spanner/connection_options_test.cc	100% <0%> (ø)	⬆️
...oogle/cloud/spanner/internal/database_admin_stub.h
...oogle/cloud/spanner/internal/instance_admin_stub.h	100% <0%> (ø)
... and 7 more

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