[near-operation-file-preset] Add `presetConfig.filePerOperation` to generate one file per operation #3837

Job	Run time
Testing exports integrity	43s
Validating dev-tests (esm)	30s
🧹 Prettier Check	29s
Linting Check / eslint	27s
Validating dev-tests (cjs)	28s
Unit Test on Node ${{ matrix.node_version }} (${{ matrix.os }}) and GraphQL v${{ matrix.graphql_version }}	0s
	2m 37s

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