[Improvement] Calulate package size from bin property

[kravetsone]

for my library that only npx/bunx executable i got this error)

EntryPointError
We could not guess a valid entry point for this package. Perhaps the author hasn't specified one in its package.json ?

Describe the solution you'd like

Calulate package size with binaries

"bin": {
        "create-elysiajs": "dist/index.js"
    },