fix: preserve default values in x-goog-request-params header (#24)

- [ ] Regenerate this pull request now.

PiperOrigin-RevId: 474338479

Source-Link: googleapis/googleapis@d5d35e0

Source-Link: googleapis/googleapis-gen@efcd3f9
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiZWZjZDNmOTM5NjJhMTAzZjY4ZjAwM2UyYTFlZWNkZTZmYTIxNmEyNyJ9

feat!: update BigQuery Analytics Hub API v1beta1 client
BREAKING CHANGE: refresh current dataexchange/v1beta1/* directory to include recent change in protos. Removed common directory and use local enum Category
fix!: refactor references to Category message
docs: improve proto documentation.

PiperOrigin-RevId: 471349319

Source-Link: googleapis/googleapis@8495024

Source-Link: googleapis/googleapis-gen@2d8c38b
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiMmQ4YzM4YjkwYTVhMTk4ZDcxZWIxYThlYjQzZTBjZTU2MTI3YWMwZCJ9

fix: use _gaxModule when accessing gax for bundling
PiperOrigin-RevId: 470911839

Source-Link: googleapis/googleapis@3527566

Source-Link: googleapis/googleapis-gen@f16a1d2
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiZjE2YTFkMjI0ZjAwYTYzMGVhNDNkNmE5YTFhMzFmNTY2ZjQ1Y2RlYSJ9

feat: accept google-gax instance as a parameter
Please see the documentation of the client constructor for details.

PiperOrigin-RevId: 470332808

Source-Link: googleapis/googleapis@d4a2367

Source-Link: googleapis/googleapis-gen@e97a1ac
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiZTk3YTFhYzIwNGVhZDRmZTczNDFmOTFlNzJkYjdjNmFjNjAxNjM0MSJ9

Author: gcf-owl-bot[bot]