chore: move protocol to d.ts types only files

[mxschmitt]

recorder,html-reporter types were moved already to a d.ts file and protocol (this PR) have some shared types we require in playwright/playwright-core. We renamed them from .ts to .d.ts to be more explicit that these are types only.

[github-actions]

Test results for "tests 1"

2 failed
❌ [playwright-test] › runner.spec.ts:118:5 › should ignore subprocess creation error because of SIGINT @macos-latest-node18-1
❌ [webkit-page] › page/page-leaks.spec.ts:82:5 › click should not leak @webkit-ubuntu-22.04-node18

3 flaky

⚠️ [firefox-page] › page/page-evaluate.spec.ts:403:3 › should throw for too deep reference chain @firefox-ubuntu-22.04-node18
⚠️ [webkit-library] › library/proxy.spec.ts:93:11 › should proxy local network requests › by default › link-local @webkit-ubuntu-22.04-node18
⚠️ [webkit-page] › page/page-set-input-files.spec.ts:147:3 › should upload large file @webkit-ubuntu-22.04-node18

37392 passed, 650 skipped
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Merge workflow run.