PeculiarVentures / x509 / 40516319694

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build!: ship ESM-only output for Node.js ^20.19.0 || >=22.12.0 (#159)

* build!: ship ESM-only output for Node.js ^20.19.0 || >=22.12.0

Replace rollup, rollup-plugin-typescript2, rollup-plugin-dts, babel and
terser with tsdown. The first config is the pvtsutils one plus the
LICENSE banner and unbundle: false (one build/index.js, so the
module-level registrations stay with every export under
"sideEffects": false). The second builds the browser IIFE at the same
path as before, build/x509.js (global `x509`, every dependency bundled,
minified); unpkg and jsdelivr point at it.

tsconfig is the pvtsutils one plus lib DOM (CryptoKey, Algorithm, ...),
experimentalDecorators (tsyringe @injectable()) and
useDefineForClassFields: false (subclass fields filled by onInit() from
the base constructor; vitest gets the same semantics).
emitDecoratorMetadata is dropped: none of the @injectable() classes
declares a constructor, so tsc never emitted design:paramtypes for them
and the output is identical without it.

Dependencies: @peculiar/asn1-* 3 (asn1js 4), @peculiar/asn1-schema 3 as
a peer dependency (+ dev), tslib removed. asn1js 4 and tsdown/attw are
dev dependencies. overrides give @peculiar/webcrypto 1.x (tests only)
the same asn1-schema 3 copy; otherwise its ECDSA signing fails.

Add CONTRIBUTING.md and the README "Breaking Changes In v3" section.

BREAKING CHANGE: @peculiar/x509 is ESM-only and requires Node.js
^20.19.0 || >=22.12.0 (was >=20.0.0). CommonJS code can still
require("@peculiar/x509") on these versions through require(esm);
Node.js 20.0-20.18 and 22.0-22.11 can't. build/x509.cjs.js and
build/x509.es.js are replaced by build/index.js, and deep imports are
blocked by "exports". TypeScript projects compiling to CommonJS need
"module": "node20" or "nodenext". The browser bundle build/x509.js now
targets ES2023 instead of Chrome 60. @peculiar/asn1-schema ^3.0.0 is a
peer dependency and the @peculiar/asn1-* dependencies move to 3, so ASN.1
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