lib: handle Float16Array in node:v8 serdes

[bartlomieju]

This commit adds support for Float16Array in node:v8 serde APIs.

While Float16Array is not available as a global yet (pending stabilization in V8), I "reserved" the next available index for serde purposes so other runtimes, like Deno, that already support Float16Array, can support it in node:v8 serde APIs in a future compatible way.

Closes https://github.com/nodejs/node/issues/55574.

[bartlomieju]

CC @bnoordhuis @targos

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 88.00%. Comparing base (3511c5c) to head (bce30a4). Report is 82 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #55996      +/-   ##
==========================================
+ Coverage   87.95%   88.00%   +0.04%     
==========================================
  Files         656      656              
  Lines      188304   188935     +631     
  Branches    35972    35972              
==========================================
+ Hits       165624   166271     +647     
+ Misses      15853    15833      -20     
- Partials     6827     6831       +4     

Files with missing lines	Coverage Δ
lib/v8.js	98.66% <100.00%> (+0.01%)	:arrow_up:

... and 62 files with indirect coverage changes

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/63767/

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CI: https://ci.nodejs.org/job/node-test-pull-request/63844/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/63863/

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CI: https://ci.nodejs.org/job/node-test-pull-request/63866/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/63922/

[nodejs-github-bot]

Landed in ac7fea6a1239feb9bc8c25281860aeb0e5864bc3