test: add the E2E testing

[mato533]

Description

Add a test to verify that when this library is used with electron, it works correctly from the following points of view.

1. The type that we expect is actually reflected in the typescript.
2. Build an electron app using this library and make sure IPC works as expected.

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🟢	Lines	99.31% (🎯 70%)	288 / 290
🟢	Statements	99.31% (🎯 70%)	288 / 290
🟢	Functions	100% (🎯 70%)	41 / 41
🟢	Branches	97.84% (🎯 70%)	91 / 93

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
src/channel.ts	100%	100%	100%	100%
src/preload.ts	100%	100%	100%	100%

Generated in workflow #124 for commit 39de3ac by the Vitest Coverage Report Action