crypto: optimize SubtleCrypto dispatch hot paths

[panva]

This improves several hot paths in Web Cryptography.

Per-commit gains (each vs its parent)

crypto: optimize normalizeAlgorithm hot path

• Replace the O(n) case-insensitive for...in loop with an O(1) SafeMap lookup pre-built at module init.
• Hoist the { prefix, context } options object to module scope.
• Pre-compute ObjectKeys() for simpleAlgorithmDictionaries entries at module init.

op	before	after	Δ
normalizeAlgorithm-string	2.1 M op/s	3.8 M op/s	+79%
normalizeAlgorithm-dict	679 k op/s	912 k op/s	+34%

crypto: reduce allocations in WebIDL dictionary converter

• Replace SafeArrayIterator with an index-based loop in the inner function returned by createDictionaryConverter.
• Replace { __proto__: null, ...opts, context } with explicit property assignment when passing opts to member converters.

op	before	after	Δ
webidl-dict	1.58 M op/s	1.62 M op/s	+2.3%
webidl-dict-null	136 M op/s	219 M op/s	+61%

crypto: skip string tag allocation in AlgorithmIdentifier fast path

• Use a direct typeof check in converters.object and converters.AlgorithmIdentifier instead of the generic type() helper, which returned an intermediate 'Object' / 'Null' / ... string tag.

op	before	after	Δ
webidl-algorithm-identifier-string	195 M op/s	195 M op/s	neutral
webidl-algorithm-identifier-object	130 M op/s	278 M op/s	+114%

crypto: streamline WebIDL dictionary converter hot loop

• Classify V with typeof instead of type().
• Hoist opts.prefix/opts.context and allMembers.length out of the loop; initialize allMembers with direct index assignment.
• Drops the now-unused module-local type() helper.

op	before	after	Δ
webidl-dict	1.62 M op/s	1.65 M op/s	+1.6%
normalizeAlgorithm-dict	912 k op/s	936 k op/s	+2.7%
webidl-dict-enforce-range	1.04 M op/s	1.08 M op/s	+3.9%

crypto: reuse enforceRange option object for WebIDL integer members

• The inline [EnforceRange] unsigned short/long/octet wrappers spread the per-member opts object into a new one solely to set enforceRange: true. Replace the 18 inline wrappers with shared helpers that mutate the caller-supplied opts in place.

op	before	after	Δ
webidl-dict-enforce-range	1.08 M op/s	1.29 M op/s	+19.7%

Cumulative

op	baseline	final	Δ
normalizeAlgorithm-string	2.1 M op/s	3.8 M op/s	+79%
normalizeAlgorithm-dict	679 k op/s	936 k op/s	+38%
webidl-dict	1.58 M op/s	1.65 M op/s	+5%
webidl-dict-null	136 M op/s	211 M op/s	+55%
webidl-algorithm-identifier-string	197 M op/s	197 M op/s	neutral
webidl-algorithm-identifier-object	130 M op/s	278 M op/s	+114%
webidl-dict-enforce-range	1.05 M op/s	1.29 M op/s	+23%

A benchmark is added in the first commit (benchmark/crypto/webcrypto-webidl.js) covering normalizeAlgorithm, converters.AlgorithmIdentifier, createDictionaryConverter (with/without [EnforceRange] integer members and with a null/undefined required-member fast path), and converters.AeadParams.

[nodejs-github-bot]

Review requested:

• @nodejs/crypto

[codecov]

Codecov Report

❌ Patch coverage is 92.50000% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.67%. Comparing base (ed05549) to head (f98babc).
⚠️ Report is 37 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/internal/crypto/util.js	87.27%	6 Missing and 1 partial ⚠️
lib/internal/crypto/webidl.js	96.92%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #62756      +/-   ##
==========================================
- Coverage   89.69%   89.67%   -0.03%     
==========================================
  Files         706      706              
  Lines      218127   218202      +75     
  Branches    41734    41745      +11     
==========================================
+ Hits       195651   195664      +13     
- Misses      14400    14455      +55     
- Partials     8076     8083       +7     

Files with missing lines	Coverage Δ
lib/internal/crypto/webidl.js	98.33% <96.92%> (-0.09%)	⬇️
lib/internal/crypto/util.js	95.90% <87.27%> (+0.38%)	⬆️

... and 58 files with indirect coverage changes

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