feat: add crud support for keys

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

synthtool > Executing /tmpfs/src/git/autosynth/working_repo/synth.py.
synthtool > Ensuring dependencies.
synthtool > Pulling artman image.
latest: Pulling from googleapis/artman
Digest: sha256:c773192618c608a7a0415dd95282f841f8e6bcdef7dd760a988c93b77a64bd57
Status: Image is up to date for googleapis/artman:latest
synthtool > Cloning googleapis.
synthtool > Running generator for google/cloud/recaptchaenterprise/artman_recaptchaenterprise_v1beta1.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/js/recaptchaenterprise-v1beta1.
.eslintignore
.eslintrc.yml
.github/ISSUE_TEMPLATE/bug_report.md
.github/ISSUE_TEMPLATE/feature_request.md
.github/ISSUE_TEMPLATE/support_request.md
.github/PULL_REQUEST_TEMPLATE.md
.github/release-please.yml
.jsdoc.js
.kokoro/common.cfg
.kokoro/continuous/node10/common.cfg
.kokoro/continuous/node10/docs.cfg
.kokoro/continuous/node10/lint.cfg
.kokoro/continuous/node10/samples-test.cfg
.kokoro/continuous/node10/system-test.cfg
.kokoro/continuous/node10/test.cfg
.kokoro/continuous/node12/common.cfg
.kokoro/continuous/node12/test.cfg
.kokoro/continuous/node8/common.cfg
.kokoro/continuous/node8/test.cfg
.kokoro/docs.sh
.kokoro/lint.sh
.kokoro/presubmit/node10/common.cfg
.kokoro/presubmit/node10/docs.cfg
.kokoro/presubmit/node10/lint.cfg
.kokoro/presubmit/node10/samples-test.cfg
.kokoro/presubmit/node10/system-test.cfg
.kokoro/presubmit/node10/test.cfg
.kokoro/presubmit/node12/common.cfg
.kokoro/presubmit/node12/test.cfg
.kokoro/presubmit/node8/common.cfg
.kokoro/presubmit/node8/test.cfg
.kokoro/presubmit/windows/common.cfg
.kokoro/presubmit/windows/test.cfg
.kokoro/publish.sh
.kokoro/release/docs.cfg
.kokoro/release/docs.sh
.kokoro/release/publish.cfg
.kokoro/samples-test.sh
.kokoro/system-test.sh
.kokoro/test.bat
.kokoro/test.sh
.kokoro/trampoline.sh
.nycrc
.prettierignore
.prettierrc
CODE_OF_CONDUCT.md
CONTRIBUTING.md
LICENSE
README.md
codecov.yaml
renovate.json
samples/README.md
npm WARN npm npm does not support Node.js v12.13.1
npm WARN npm You should probably upgrade to a newer version of node as we
npm WARN npm can't make any promises that npm will work with this version.
npm WARN npm Supported releases of Node.js are the latest release of 6, 8, 9, 10, 11.
npm WARN npm You can find the latest version at https://nodejs.org/

> protobufjs@6.8.8 postinstall /tmpfs/src/git/autosynth/working_repo/node_modules/protobufjs
> node scripts/postinstall

npm notice created a lockfile as package-lock.json. You should commit this file.
added 553 packages from 771 contributors and audited 1215 packages in 9.171s
found 0 vulnerabilities

npm WARN npm npm does not support Node.js v12.13.1
npm WARN npm You should probably upgrade to a newer version of node as we
npm WARN npm can't make any promises that npm will work with this version.
npm WARN npm Supported releases of Node.js are the latest release of 6, 8, 9, 10, 11.
npm WARN npm You can find the latest version at https://nodejs.org/

> @google-cloud/recaptcha-enterprise@1.3.1 fix /tmpfs/src/git/autosynth/working_repo
> eslint --fix '**/*.js'


/tmpfs/src/git/autosynth/working_repo/samples/test/samples.test.js
  26:5  warning  Unexpected 'todo' comment  no-warning-comments

✖ 1 problem (0 errors, 1 warning)

synthtool > Cleaned up 2 temporary directories.
synthtool > Wrote metadata to synth.metadata.

[codecov]

Codecov Report

Merging #84 into master will decrease coverage by 1.49%.
The diff coverage is 74.6%.

@@            Coverage Diff            @@
##           master      #84     +/-   ##
=========================================
- Coverage   78.04%   76.55%   -1.5%     
=========================================
  Files           6        8      +2     
  Lines          82      145     +63     
=========================================
+ Hits           64      111     +47     
- Misses         18       34     +16

Impacted Files	Coverage Δ
src/v1beta1/doc/google/protobuf/doc_empty.js	0% <0%> (ø)
...ptchaenterprise/v1beta1/doc_recaptchaenterprise.js	0% <0%> (ø)	⬆️
src/v1beta1/doc/google/protobuf/doc_field_mask.js	0% <0%> (ø)
...a1/recaptcha_enterprise_service_v1_beta1_client.js	88.98% <92.15%> (+2.41%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 0e96508...0f76116. Read the comment docs.