Upgrade jest to v29

[MrOrz]

• y.js's dependency, lib0, uses exports in package.json to differentiate files served for import and require()
• However, Jest < 28 does not support that, causing jest always loads lib0 in ESM format even when require() is used in yjs
• Ref: https://jestjs.io/blog/2022/04/25/jest-28#packagejson-exports
• snapshotFormat is set to minimize change impact, as Jest 29 changes the default snapshot format
• Add memory limit to avoid heap space overflow
• Fix broken test
• Remove unused babel-plugin-rewire

[coveralls]

coverage: 88.417% (-0.01%) from 88.431% when pulling 8884df51e40b17e313e187625038a03afe853289 on upgrade-jest into f305638817c607a7861b62a1686e25bc1820a96c on master.