chore: add emitDeclarationOnly settings for typescript

[MaikoTan]

This is the following fixup for #234 which switch TypeScript to ESNext module causing the result to be ESM, this setting would make tsc generates definitions only, and the JS part would be built by esbuild which guarantee to be CJS.

[github-actions]

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esbuild: packages/core/src/index.ts -> packages/core/lib/index.js
esbuild: packages/danbooru/src/index.ts -> packages/danbooru/lib/index.js
esbuild: packages/e621/src/index.ts -> packages/e621/lib/index.js
esbuild: packages/gelbooru/src/index.ts -> packages/gelbooru/lib/index.js
esbuild: packages/konachan/src/index.ts -> packages/konachan/lib/index.js
esbuild: packages/local/src/index.ts -> packages/local/lib/index.js
esbuild: packages/lolibooru/src/index.ts -> packages/lolibooru/lib/index.js
esbuild: packages/lolicon/src/index.ts -> packages/lolicon/lib/index.js
esbuild: packages/moehu/src/index.ts -> packages/moehu/lib/index.js
esbuild: packages/pixiv/src/index.ts -> packages/pixiv/lib/index.js
esbuild: packages/safebooru/src/index.ts -> packages/safebooru/lib/index.js
esbuild: packages/sankaku/src/index.ts -> packages/sankaku/lib/index.js
esbuild: packages/yande/src/index.ts -> packages/yande/lib/index.js

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