fix: deprecate several vitest/* entry points

[sheremet-va]

Description

In an effort to reduce the amount of chunks in Vitest's dist directory (which should make the startup time faster), I propose removing some of the entry points:

• vitest/coverage -> use vitest/node instead
• vitest/reporters -> use vitest/node instead
• vitest/environments -> use vitest/runtime instead
• vitest/snapshot -> use vitest/runtime instead
• vitest/runners -> use vitest instead
• vitest/suite -> use static methods on TestRunner from vitest instead: import("vitest").TestRunner.getCurrentTest()
• vitest/mocker is removed completely, use @vitest/mocker package directly (this was published by accident at one point and never removed)
• vitest/internal/module-runner is removed, the code is moved to __INTERNAL in vitest/runtime

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