[gatsby-plugin-typescript]: options schema is missing a few options

[hasparus]

All options are passed to babel-preset-typescript, which also supports jsxPragmaFrag, allowNamespaces, allowDeclareFields, and onlyRemoveTypeImports.

11:30:38 AM: warning Warning: there are unknown plugin options for "gatsby-plugin-typescript": allowNamespaces
11:30:38 AM: Please open an issue at ghub.io/gatsby-plugin-typescript if you believe this option is valid.

gatsby/packages/gatsby-plugin-typescript/src/gatsby-node.js

Lines 3 to 7 in bd5b5f7

	function onCreateBabelConfig({ actions }, options) {
	actions.setBabelPreset({
	name: require.resolve(`@babel/preset-typescript`),
	options,
	})

gatsby/packages/gatsby-plugin-typescript/src/gatsby-node.js

Lines 38 to 48 in bd5b5f7

	exports.pluginOptionsSchema = ({ Joi }) =>
	Joi.object({
	isTSX: Joi.boolean().description(`Enables jsx parsing.`).default(false),
	jsxPragma: Joi.string()
	.description(`Replace the function used when compiling JSX expressions.`)
	.default(`React`),
	allExtensions: Joi.boolean()
	.description(`Indicates that every file should be parsed as TS or TSX.`)
	.default(false)
	.when(`isTSX`, { is: true, then: Joi.valid(true) }),
	})