feat: cli: allow imports with explicit extension

[fabianhjr]

Changes proposed in this pull request:
⯈ Allow imports with explicit extension set

Eg, deno / bun allow and prefer something like

export { Parser0 } from "./parsers/Parser0.ts";
export { Parser } from "./parsers/Parser.ts";
export { ParserResult } from "./parsers/ParserResult.ts";

But AssemblyScript complains:

ERROR TS6054: File 'src/parsers/Parser0.ts.ts' not found.
   :
 1 │ export { Parser0 } from "./parsers/Parser0.ts";
   │                         ~~~~~~~~~~~~~~~~~~~~~~
   └─ in src/index.ts(1,25)

ERROR TS6054: File 'src/parsers/Parser.ts.ts' not found.
   :
 2 │ export { Parser } from "./parsers/Parser.ts";
   │                        ~~~~~~~~~~~~~~~~~~~~~
   └─ in src/index.ts(2,24)

ERROR TS6054: File 'src/parsers/ParserResult.ts.ts' not found.
   :
 3 │ export { ParserResult } from "./parsers/ParserResult.ts";
   │                              ~~~~~~~~~~~~~~~~~~~~~~~~~~~
   └─ in src/index.ts(3,30)

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[fabianhjr]

During testing noticed some errors due to program/ast/parser expecting imports not to have extension however seems to be more involved than originally expected.

[fabianhjr]

▌ Whoops, the AssemblyScript compiler has crashed during initialize :-(
▌ 
▌ Here is the stack trace hinting at the problem, perhaps it's useful?
▌ 
▌ AssertionError: assertion failed
▌     at Z.assert (/nix/store/l39m7jqnl54p2h7a50knvwfm602cnipm-assemblyscript-0.27.30/lib/node_modules/assemblyscript/std/portable/index.js:216:11)
▌     at Un.initialize (/nix/store/l39m7jqnl54p2h7a50knvwfm602cnipm-assemblyscript-0.27.30/lib/node_modules/assemblyscript/src/program.ts:1241:29)
▌     at Module.B0 (/nix/store/l39m7jqnl54p2h7a50knvwfm602cnipm-assemblyscript-0.27.30/lib/node_modules/assemblyscript/src/index-wasm.ts:352:11)
▌     at Module.Me (/nix/store/l39m7jqnl54p2h7a50knvwfm602cnipm-assemblyscript-0.27.30/lib/node_modules/assemblyscript/cli/index.js:717:22)
▌     at async file:///nix/store/l39m7jqnl54p2h7a50knvwfm602cnipm-assemblyscript-0.27.30/lib/node_modules/assemblyscript/bin/asc.js:33:22
▌ 
▌ If you see where the error is, feel free to send us a pull request. If not,
▌ please let us know: https://github.com/AssemblyScript/assemblyscript/issues
▌ 

in particular foreginPath now comes with .ts when it previously didn't which throws a wrench into resolution/matching.