fix: use require to load proto JSON

[alexander-fenster]

Fixes #1246.

Regenerating the code using gapic-generator-typescript v1.3.2. The main change is introduced in googleapis/gapic-generator-typescript#861. The generated proto changes are related to the changes in oneof field default values (that should be unset), that was introduced by protobufjs/protobuf.js#1597 and is unrelated to the proto JSON require problem.

[codecov]

Codecov Report

Merging #1283 (ae17ea3) into master (09c428a) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1283      +/-   ##
==========================================
- Coverage   97.84%   97.84%   -0.01%     
==========================================
  Files          26       26              
  Lines       12700    12738      +38     
  Branches      558      605      +47     
==========================================
+ Hits        12426    12463      +37     
- Misses        268      269       +1     
  Partials        6        6              

Impacted Files	Coverage Δ
src/publisher/index.ts	97.64% <100.00%> (+0.24%)	⬆️
src/publisher/message-batch.ts	100.00% <100.00%> (ø)
src/publisher/message-queues.ts	98.81% <100.00%> (+0.10%)	⬆️
src/topic.ts	98.66% <100.00%> (+0.02%)	⬆️
src/v1/publisher_client.ts	97.71% <100.00%> (-0.03%)	⬇️
src/v1/schema_service_client.ts	97.56% <100.00%> (-0.03%)	⬇️
src/v1/subscriber_client.ts	98.19% <100.00%> (-0.02%)	⬇️
src/pubsub.ts	99.46% <0.00%> (-0.08%)	⬇️

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