Add `AbiEncode` and `AbiDecode` for `String` #19669

Job	Run time
get-fuel-core-version	46s
build-reference-examples	1m 20s
build-sway-examples	1m 38s
build-sway-lib-core	1m 3s
build-sway-lib-std	1m 16s
check-sdk-harness-test-suite-compatibility	41s
forc-fmt-check-panic	1m 44s
forc-fmt-check-sway-examples	53s
forc-fmt-check-sway-lib-core	1m 6s
forc-fmt-check-sway-lib-std	58s
build-forc-doc-sway-lib-std	2m 3s
build-forc-test-project	5m 9s
cargo-build-workspace	3m 42s
build-mdbook	4m 31s
cargo-clippy	1m 2s
cargo-fmt-check	11s
cargo-toml-fmt-check	12s
cargo-run-e2e-test-evm	2m 36s
cargo-test-lib-std	8m 22s
cargo-run-e2e-test-midenvm	2m 44s
cargo-test-sway-lsp	5m 20s
cargo-test-workspace	5m 27s
forc-pkg-fuels-deps-check	16s
forc-run-benchmarks	3m 46s
forc-unit-tests	1m 55s
cargo-unused-deps-check	4m 22s
pre-publish-check	0s
cargo-run-e2e-test	12m 42s
cargo-test-forc-debug	4m 7s
cargo-run-e2e-test-release	14m 49s
notify-slack-on-failure	4s
build-publish-master-image	0s
publish	0s
build-publish-release-image	0s
Build and upload forc binaries to release	0s
	1h 34m 45s

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