Config file

[dmail]

This PR is based on #81 (thank you @kayahr).

It adds unit tests to ensure the config file work as expected.

The test saves html being produced into https://github.com/jsenv/importmap-node-module/blob/90b3055c0b31ba243eb263d3a4168d0a6438cb87/tests/cli/config_file/snapshots/index.html

And it executes that html alongside its files to ensure all works as expected when axios is remapped in

importmap-node-module/tests/cli/config_file/cli_config_file.test.mjs

Lines 33 to 35 in 90b3055

	const actual = await executeHtml(`${buildServer.origin}/index.html`);
	const expect = "axios";
	assert({ actual, expect });

I'm about to merge this PR that will publish version 7.3.0

[github-actions]

Performance impact

Impact on 9 metrics when merging config_file into main. Before drawing conclusion, keep in mind performance variability.

package metrics (+0.1%)

Metric	Before merge	After merge	Impact
import duration	0.2 second	0.2 second	-0.003 second / -2%	↘️
import memory heap used	8.9 MB	8.9 MB	-704 B / -0.008%	↘️
npm tarball size	26.5 kB	26.8 kB	+321 B / +1%	↗️
npm tarball unpacked size	115 kB	116 kB	+1.1 kB / +1%	↗️
npm tarball file count	23	23		👻

write importmap metrics (+0.2%)

Metric	Before merge	After merge	Impact
write importmap duration	0.2 second	0.2 second	+0.001 second / +0.5%	↗️
write importmap memory heap used	9 MB	9 MB	-1.5 kB / -0.02%	↘️
number of fs read operation	0	0		👻
number of fs write operation	8	8		👻

_{Generated by @jsenv/performance-impact during performance_impact#15468655885 on 70a9d74}