Support Windows line-endings in TOML files

[matteodepalo]

Taking inspiration from cloudflare/workers-sdk#936

Our TOML parsing code is susceptible to the same issue so I'm preventively fixing it.

[github-actions]

We detected some changes at either packages/*/src or packages/cli-kit/assets/cli-ruby/** and there are no updates in the .changeset.
If the changes are user-facing, run "pnpm changeset add" to track your changes and include them in the next release CHANGELOG.

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟡	Statements	73.83% (+0.04% 🔼)	5577/7554
🟡	Branches	70.71% (-0.02% 🔻)	2702/3821
🟡	Functions	72.67% (+0.03% 🔼)	1436/1976
🟡	Lines	75.5% (+0.09% 🔼)	5316/7041

Show new covered files 🐣

St.❔	File	Statements	Branches	Functions	Lines
🟢	... / flow_action.ts	100%	100%	100%	100%
🟢	... / flow_trigger.ts	100%	100%	100%	100%
🟢	... / checkout_post_purchase.ts	100%	100%	100%	100%
🟢	... / customer_accounts_ui_extension.ts	100%	100%	100%	100%
🟢	... / pos_ui_extension.ts	100%	100%	100%	100%
🟢	... / tax_calculation.ts	100%	100%	100%	100%

Show files with reduced coverage 🔻

St.❔	File	Statements	Branches	Functions	Lines
🟢	... / extension-instance.ts	86.54% (-0.13% 🔻)	77.5%	93.75% (-0.19% 🔻)	88.54% (-0.12% 🔻)
🟢	... / context.ts	93.78%	87.3% (-0.2% 🔻)	100%	95.03%
🟢	... / link.ts	88.46% (-1.73% 🔻)	72.55% (-11.17% 🔻)	100%	88.46% (-1.73% 🔻)
🟢	... / prompts.ts	82.86% (-2.86% 🔻)	84.85% (+2.8% 🔼)	76% (-4% 🔻)	84.13% (-2.29% 🔻)
🟢	... / serialize-fields.ts	96.77% (-0.2% 🔻)	95.45% (+3.15% 🔼)	100%	100%
🟢	... / metadata.ts	96%	87.5% (-1.39% 🔻)	100%	96%

Test suite run success

1323 tests passing in 647 suites.

Report generated by 🧪jest coverage report action from 2e9b8f4

[amcaplan]

I'd love to see a small test, especially if it shows the value of this.