Breaking: Remove deprecated LocalizedStringResource API

[liamnichols]

Since 0.4.0, the LocalizedStringResource.XXX struct is now deprecated and instead the String.XXX struct should be used.

To prepare for 1.0.0, and some other upcoming changes, i'm now removing this deprecated code.

[github-actions]

✅ Pull Request passed benchmark checks

Summary

Fri Jul 19 15:50:37 UTC 2024

===========================================================================================================
Threshold deviations for StringGenerator.generateSource(for:tableName:accessLevel:):XCStringsToolBenchmarks
===========================================================================================================

Time (total CPU) (ms, %)	main	pull_request	Difference %	Threshold %
p25	704	384	-45	5
p50	704	395	-43	5
p75	707	398	-43	5

New baseline 'pull_request' is BETTER than the 'main' baseline thresholds.

---

Comparing results between 'main' and 'pull_request'

Host 'Mac-1721402931035.local' with 3 'arm64' processors with 7 GB memory, running:
Darwin Kernel Version 23.5.0: Wed May  1 20:12:39 PDT 2024; root:xnu-10063.121.3~5/RELEASE_ARM64_VMAPPLE

XCStringsToolBenchmarks

StringGenerator.generateSource(for:tableName:accessLevel:) metrics

Time (total CPU): results within specified thresholds, fold down for details.

Time (total CPU) (ms) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	703	704	704	707	707	707	707	2
pull_request	383	384	395	398	398	398	398	3
Δ	-320	-320	-309	-309	-309	-309	-309	1
Improvement %	46	45	44	44	44	44	44	1

[liamnichols]

almost 2x speed improvement 😬