feat(nitro): Nitro SDK entry and metadata

[logaretm]

This PR just isolates the mundane changes needed for a new SDK to keep the next stacked PRs clean, it adds the Nitro SDK to the monorepo.

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This PR is part of a Stack:

• feat(nitro): Nitro SDK entry and metadata #19224 👈
• feat(nitro): Instrument HTTP Server #19225

[github-actions]

Codecov Results 📊

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Generated by Codecov Action

[github-actions]

node-overhead report 🧳

Note: This is a synthetic benchmark with a minimal express app and does not necessarily reflect the real-world performance impact in an application.

Scenario	Requests/s	% of Baseline	Prev. Requests/s	Change %
GET Baseline	11,636	-	8,621	+35%
GET With Sentry	2,033	17%	1,613	+26%
GET With Sentry (error only)	7,858	68%	5,864	+34%
POST Baseline	1,200	-	1,160	+3%
POST With Sentry	616	51%	560	+10%
POST With Sentry (error only)	1,094	91%	1,009	+8%
MYSQL Baseline	4,127	-	3,172	+30%
MYSQL With Sentry	629	15%	402	+56%
MYSQL With Sentry (error only)	3,400	82%	2,548	+33%

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