feat(backend): replace webpack with esbuild

[trivikr]

Issue

Fixes: #5

Description

Replaces webpack with esbuild in the backend.

Before

$ yarn build
asset updateNote/app.js 216 KiB [emitted] [minimized] (name: updateNote) 1 related asset
asset createNote/app.js 215 KiB [emitted] [minimized] (name: createNote)
asset deleteNote/app.js 215 KiB [emitted] [minimized] (name: deleteNote) 1 related asset
asset getNote/app.js 213 KiB [emitted] [minimized] (name: getNote) 1 related asset
asset listNotes/app.js 211 KiB [emitted] [minimized] (name: listNotes) 1 related asset
orphan modules 1.77 MiB [orphan] 274 modules
runtime modules 4.58 KiB 20 modules
built modules 6.98 MiB [built]
  cacheable modules 106 KiB
    javascript modules 76 KiB 18 modules
    json modules 30 KiB 4 modules
  modules by path ./src/ 6.87 MiB
    ./src/createNote.ts + 164 modules 1.38 MiB [not cacheable] [built] [code generated]
    ./src/deleteNote.ts + 164 modules 1.37 MiB [not cacheable] [built] [code generated]
    ./src/getNote.ts + 166 modules 1.39 MiB [not cacheable] [built] [code generated]
    ./src/listNotes.ts + 164 modules 1.36 MiB [not cacheable] [built] [code generated]
    ./src/updateNote.ts + 164 modules 1.37 MiB [not cacheable] [built] [code generated]
webpack 5.19.0 compiled successfully in 12709 ms

After

$ yarn build

  dist/updateNote/app.js  498.4kb
  dist/createNote/app.js  498.4kb
  dist/getNote/app.js     498.3kb
  dist/deleteNote/app.js  498.3kb
  dist/listNotes/app.js   498.2kb

⚡ Done in 102ms

Testing

Local testing.

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