refactor config options to be stored in a single schema that gets parsed/validated

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currently the options are defined in many different places and each option gets validated manually

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it should handle generating the docs for the rules. because currently you have to manually update them to match the defaults as well: https://detachhead.github.io/basedpyright/#/configuration?id=diagnostic-rule-defaults

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update: this table is now generated as of #759

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related issues:

• load rules/defaults from basedpyright package instead of maintaining a separate list basedpyright-playground#13
• check to ensure that getDiagLevelDiagnosticRules list matches the actual list #43

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also the code to parse the lsp config is completely separate to the code that parses thwe config files for some reason