fix(functions): unbundle to slug directory by default

[sweatybridge]

What kind of change does this PR introduce?

Bug fix #1912

What is the current behavior?

If only --entrypoint flag is used, the eszip will be unbundled as a single index.ts file

edge-runtime bundle --entrypoint functions/hello/index.ts --output /tmp/output.eszip
edge-runtime unbundle --eszip /tmp/output.eszip --output .

But if an --import-map flag is also used, for eg.

edge-runtime bundle --entrypoint functions/hello/index.ts --import-map import_map.json --output /tmp/output.eszip
edge-runtime unbundle --eszip /tmp/output.eszip --output .

The entrypoint file will be extracted relative to the import map:

import_map.json
functions/hello/index.ts

What is the new behavior?

It's too complicated to maintain the original bundled file structure when extracting. So we will simply extract the eszip folder as it is.

Additional context

Add any other context or screenshots.

[coveralls]

Pull Request Test Coverage Report for Build 8574405906

Details

• 0 of 23 (0.0%) changed or added relevant lines in 1 file are covered.
• 5 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.06%) to 57.801%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
internal/functions/download/download.go	0	23	0.0%

Files with Coverage Reduction	New Missed Lines	%
internal/gen/keys/keys.go	5	11.76%

Totals
Change from base Build 8571489894:	-0.06%
Covered Lines:	6376
Relevant Lines:	11031

---

💛 - Coveralls