Move to @npmcli/package-json

[wraithgar]

This PR is a series of commits that moves npm itself to use the
package.json parsing logic that was moved from read-package-json and
read-package-json-fast into @npmcli/package-json

It ends with the removal of the first two packages as direct dependents
of the cli. A bit more work needs to be done to remove their usage
elsewhere.

[npm-cli-bot]

no statistically significant performance changes detected

timing results

app-large	clean	lock-only	cache-only	cache-only peer-deps	modules-only	no-lock	no-cache	no-modules	no-clean	no-clean audit	show-version	run-script
npm@9	51.479 ±4.46	23.498 ±0.02	22.758 ±0.09	25.432 ±0.60	3.513 ±0.03	3.550 ±0.07	3.118 ±0.01	15.935 ±0.14	2.949 ±0.03	4.448 ±0.01	0.476 ±0.01	0.506 ±0.01
#6472	54.219 ±3.26	24.043 ±0.34	25.127 ±2.14	26.204 ±0.40	3.634 ±0.14	3.609 ±0.10	3.163 ±0.07	16.443 ±0.41	3.037 ±0.06	4.672 ±0.41	0.466 ±0.00	0.530 ±0.01

app-medium	clean	lock-only	cache-only	cache-only peer-deps	modules-only	no-lock	no-cache	no-modules	no-clean	no-clean audit	show-version	run-script
npm@9	36.310 ±0.87	17.862 ±0.20	17.379 ±0.11	18.797 ±0.52	3.207 ±0.02	3.212 ±0.02	3.063 ±0.06	11.680 ±0.02	2.841 ±0.02	3.948 ±0.01	0.449 ±0.01	0.489 ±0.01
#6472	37.130 ±1.78	18.182 ±0.15	17.640 ±0.09	18.676 ±0.67	3.223 ±0.00	3.292 ±0.02	3.102 ±0.06	11.935 ±0.07	2.927 ±0.03	3.991 ±0.00	0.463 ±0.01	0.525 ±0.01