support nodejs v18

[jasonHzq]

running command as below:

srcbook start

cli throw error messages:

~/.nvm/versions/node/v18.17.0/lib/node_modules/srcbook/node_modules/@srcbook/shared/dist/src/utils.js:3
    const bytes = crypto.getRandomValues(new Uint8Array(byteSize));
                  ^

ReferenceError: crypto is not defined
    at randomid (~/.nvm/versions/node/v18.17.0/lib/node_modules/srcbook/node_modules/@srcbook/shared/dist/src/utils.js:3:19)
    at ~/.nvm/versions/node/v18.17.0/lib/node_modules/srcbook/lib/db/schema.mjs:13:66

I see your document nodejs version requirements is v20+. can you support nodejs v18.

[nichochar]

Yeah, we're aware of this. For now, can you use node 20+? We recommend using https://github.com/nvm-sh/nvm