feat: support adding static files to Edge Functions

[laktek]

What kind of change does this PR introduce?

This PR introduces a new config static_files, which can be defined per function in config.toml. This can be used to add static files (eg: HTML, WASM) to Edge Functions.

Eg:

[functions.serve-html]
static_files = [ "functions/serve-html/*.html" ]

Which can then be read in Edge Function, like:

const file = await Deno.readTextFile(new URL("foo.html", import.meta.url))

[coveralls]

Pull Request Test Coverage Report for Build 12789317426

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 6 of 15 (40.0%) changed or added relevant lines in 5 files are covered.
• 82 unchanged lines in 4 files lost coverage.
• Overall coverage decreased (-0.08%) to 58.365%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
internal/functions/deploy/bundle.go	2	4	50.0%
pkg/config/config.go	1	3	33.33%
pkg/function/bundle.go	2	4	50.0%
internal/functions/serve/serve.go	0	3	0.0%

Files with Coverage Reduction	New Missed Lines	%
pkg/config/secret.go	3	94.44%
internal/debug/postgres.go	3	64.86%
internal/gen/keys/keys.go	5	12.9%
pkg/config/config.go	71	52.17%

Totals
Change from base Build 12772880210:	-0.08%
Covered Lines:	7577
Relevant Lines:	12982

---

💛 - Coveralls

[sweatybridge]

Generally ok, commented on some edge cases