* feat(devkit): split create-empty-tree to different functions
* chore(repo): apply migration for createEmptyTree
* cleanup(misc): fix tests that migration misses
* feat(core): add nx.json, workspace.json, and project.json JSON schemas
ISSUES CLOSED: #8574, #2299
* fix(core): add ajv to test generated config files based on JSON schema
* fix(core): only add $schema to project.json if it is standalone and in create mode
* feat(core): add migration to add json schema to config files for 14.2.0
* fix(core): adjust schemas
* chore(core): adjust tests across repo to adhere to JSON schema if generated
* fix(core): construct the json schema object instead of using a boolean flag
* chore(core): add ajv tests for workspacejson and nxjson
* chore(core): remove unnecessary standalone check
