Add support for Display String type to StructuredFieldValues #31

Job	Run time
Soundness / API breakage check	45s
Soundness / Documentation check	59s
Soundness / License headers check	9s
Soundness / Broken symlinks check	2s
Soundness / Unacceptable language check	3s
Soundness / Format check	38s
Soundness / Python lint check	5s
Soundness / Shell check	37s
Soundness / YAML lint check	2s
Cxx interop / Cxx interop / Windows (6.0)	3s
Cxx interop / Cxx interop / Windows (nightly-6.0)	3s
Cxx interop / Cxx interop / Linux (5.9)	45s
Cxx interop / Cxx interop / Windows (nightly-main)	2s
Cxx interop / Cxx interop / Linux (5.10)	51s
Cxx interop / Cxx interop / Linux (6.0)	51s
Unit tests / Unit tests / Linux (5.9)	42s
Cxx interop / Cxx interop / Linux (nightly-6.0)	55s
Unit tests / Unit tests / Linux (5.10)	47s
Unit tests / Unit tests / Windows (6.0)	2s
Cxx interop / Cxx interop / Linux (nightly-main)	56s
Unit tests / Unit tests / Linux (6.0)	47s
Unit tests / Unit tests / Linux (nightly-6.0)	57s
Unit tests / Unit tests / Linux (nightly-main)	57s
Unit tests / Unit tests / Windows (nightly-6.0)	1s
Unit tests / Unit tests / Windows (nightly-main)	1s
	12m 0s

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