fix(parser): add support for empty module declaration

[rzvxa]

Should be merged after #2829, Tried a few times to get it done with graphite stacking but found no success. I guess it either doesn't work with forks or It is just a skill issue since I'm not familiar with it.

closes: #2829
closes: #2830

[codspeed-hq]

CodSpeed Performance Report

Merging #2834 will improve performances by 4.7%

_{Comparing rzvxa:fix-empty-mod-decl (5c87d04) with main (8c6936a)}

Summary

⚡ 1 improvements
✅ 33 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	rzvxa:fix-empty-mod-decl	Change
⚡	parser_napi[checker.ts]	244.5 ms	233.6 ms	+4.7%

[Dunqing]

It looks like we should support body: Option<TSModuleDeclarationBody> instead of adding EmptyDeclaration.

Refer to TSESTree
https://github.com/typescript-eslint/typescript-eslint/blob/570726872b270dec9fcc8de8613c7e8686e87a71/packages/ast-spec/src/declaration/TSModuleDeclaration/spec.ts#L100-L101

[rzvxa]

@Dunqing Ah yes, I reworked this without looking at how it is done in Eslint. I'll make the change and mark it as ready once again.

[Boshen]

@rzvxa Graphite doesn't work with forks, that's why I gave you write access.

btw do you have discord or twitter for DMs? I want to get you involved with more things.

[rzvxa]

@Boshen Yes, I've just joined the discord server, You can find me there with the same nickname as on GitHub(rzvxa).