Add @NullUnmarked to builders

[dondonz]

Adding @NullUnmarked to a number of builders now that we've settled on this as a pattern

[github-actions]

Test Results

  326 files   -    652    326 suites   - 652   3m 34s ⏱️ - 7m 0s
5 022 tests  -    346  5 016 ✅  -    347  6 💤 + 1  0 ❌ ±0 
5 111 runs   - 10 222  5 105 ✅  - 10 211  6 💤  - 11  0 ❌ ±0 

Results for commit 0b63c84. ± Comparison against base commit 17dffdb.

This pull request removes 541 and adds 171 tests. Note that renamed tests count towards both.

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	, expected: combo-\"\\\b\f\n\r\t, #4]
                __schema { types { fields { args { type { name fields { name }}}}}}
                __schema { types { fields { type { name fields { name }}}}}
                __schema { types { inputFields { type { inputFields { name }}}}}
                __schema { types { interfaces { fields { type { interfaces { name } } } } } }
                __schema { types { name} }
                __type(name : "t") { name }
                a1: __schema { types { name} }
                a1: __type(name : "t") { name }
…

graphql.DataFetcherTest ‑ get Boolean property value [fetcher: <graphql.schema.PropertyDataFetcher@77ab22be propertyName=booleanField function=null>, #0]
graphql.DataFetcherTest ‑ get Boolean property value [fetcher: <graphql.schema.SingletonPropertyDataFetcher@1391af3b>, #1]
graphql.DataFetcherTest ‑ get Boolean property value with get [fetcher: <graphql.schema.PropertyDataFetcher@3a8d467e propertyName=booleanFieldWithGet function=null>, #0]
graphql.DataFetcherTest ‑ get Boolean property value with get [fetcher: <graphql.schema.SingletonPropertyDataFetcher@1391af3b>, #1]
graphql.DataFetcherTest ‑ get property value [fetcher: <graphql.schema.PropertyDataFetcher@49f40c00 propertyName=property function=null>, #0]
graphql.DataFetcherTest ‑ get property value [fetcher: <graphql.schema.SingletonPropertyDataFetcher@1391af3b>, #1]
graphql.DataFetcherTest ‑ get public field value as property [fetcher: <graphql.schema.PropertyDataFetcher@3ebe4ccc propertyName=publicField function=null>, #0]
graphql.DataFetcherTest ‑ get public field value as property [fetcher: <graphql.schema.SingletonPropertyDataFetcher@1391af3b>, #1]
graphql.ScalarsBooleanTest ‑ parseValue throws exception for invalid input <java.lang.Object@4888792b>
graphql.ScalarsBooleanTest ‑ serialize throws exception for invalid input <java.lang.Object@577ca7c3>
…

This pull request skips 1 test.

graphql.schema.fetching.LambdaFetchingSupportTest ‑ different class loaders induce certain behaviours