feat: add localStorage strategy to remote config

[mormubis]

Motivation

Remote configuration does not support localStorage, which is beneficial for some customers.

Changes

This PR adds the localStorage strategy for remote configuration.

Test instructions

TBD

Checklist

• Tested locally
• Tested on staging
• Added unit tests for this change.
• Added e2e/integration tests for this change.

[cit-pr-commenter]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	164.36 KiB	164.58 KiB	+225 B	+0.13%	✅
Rum Profiler	4.33 KiB	4.33 KiB	0 B	0.00%	✅
Rum Recorder	20.01 KiB	20.01 KiB	0 B	0.00%	✅
Logs	56.14 KiB	56.14 KiB	0 B	0.00%	✅
Flagging	944 B	944 B	0 B	0.00%	✅
Rum Slim	121.65 KiB	121.87 KiB	+225 B	+0.18%	✅
Worker	23.63 KiB	23.63 KiB	0 B	0.00%	✅

🚀 CPU Performance

Action Name	Base CPU Time (ms)	Local CPU Time (ms)	𝚫%
RUM - add global context	0.0044	0.0048	+9.09%
RUM - add action	0.0137	0.0131	-4.38%
RUM - add error	0.0127	0.014	+10.24%
RUM - add timing	0.0031	0.0032	+3.23%
RUM - start view	0.0041	0.0043	+4.88%
RUM - start/stop session replay recording	0.0008	0.0009	+12.50%
Logs - log message	0.0174	0.0171	-1.72%

🧠 Memory Performance

Action Name	Base Memory Consumption	Local Memory Consumption	𝚫
RUM - add global context	26.51 KiB	26.61 KiB	+103 B
RUM - add action	49.21 KiB	50.13 KiB	+946 B
RUM - add timing	24.87 KiB	24.31 KiB	-579 B
RUM - add error	56.37 KiB	54.82 KiB	-1.55 KiB
RUM - start/stop session replay recording	24.99 KiB	23.56 KiB	-1.42 KiB
RUM - start view	421.82 KiB	425.99 KiB	+4.17 KiB
Logs - log message	43.32 KiB	47.82 KiB	+4.50 KiB

🔗 RealWorld

[datadog-datadog-prod-us1]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage
• Patch Coverage: 50.00%
• Overall Coverage: 77.22% (-0.06%)

View detailed report

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