WIP: Adding parallel build

[mpodwysocki]

Starting to create a parallel build, however, getting into some odd mocking issues such as the following:

2> test/build-esm.ts
node:internal/bootstrap/switches/does_own_process_state:144
    cachedCwd = rawMethods.cwd();
                           ^

Error: ENOENT: no such file or directory, uv_cwd
    at process.wrappedCwd [as cwd] (node:internal/bootstrap/switches/does_own_process_state:144:28)
    at
file:///Users/matthewp/git/tshy/node_modules/@tapjs/processinfo/dist/esm/canonical-source.js:7:21
    at ModuleJob.run (node:internal/modules/esm/module_job:262:25)
    at async ModuleLoader.import (node:internal/modules/esm/loader:475:24)
    at async asyncRunEntryPointWithESMLoader (node:internal/modules/run_main:104:9) {
  errno: -2,
  code: 'ENOENT',
  syscall: 'uv_cwd'
}

Node.js v22.2.0
node:internal/bootstrap/switches/does_own_process_state:144
    cachedCwd = rawMethods.cwd();
                           ^

Error: ENOENT: no such file or directory, uv_cwd
    at process.wrappedCwd [as cwd] (node:internal/bootstrap/switches/does_own_process_state:144:28)
    at
file:///Users/matthewp/git/tshy/node_modules/@tapjs/processinfo/dist/esm/canonical-source.js:7:21
    at ModuleJob.run (node:internal/modules/esm/module_job:262:25)
    at async ModuleLoader.import (node:internal/modules/esm/loader:475:24)
    at async asyncRunEntryPointWithESMLoader (node:internal/modules/run_main:104:9) {
  errno: -2,
  code: 'ENOENT',
  syscall: 'uv_cwd'
}

[isaacs]

Style nit, I usually prefer to define isType methods in the same file as the type itself, to reduce the chances of having them go out of sync. (No need to change now, I'm fine moving it later, so this is more a note to myself.)