feat: faster and less noisy zk fmt (#513)

## What ❔

I've added caching to prettier and changed so that noisy output about
changed files is redirected to /dev/null. `zk fmt` is 3 times faster
after those changes

## Why ❔

`zk fmt` output was too verbose and we didn't use cache

## Checklist

- [X] PR title corresponds to the body of PR (we generate changelog
entries from PRs).
- [ ] Tests for the changes have been added / updated.
- [ ] Documentation comments have been added / updated.
- [X] Code has been formatted via `zk fmt` and `zk lint`.

infrastructure/zk/src/fmt.ts

@@ -4,6 +4,10 @@ import * as utils from './utils';
 const EXTENSIONS = ['ts', 'md', 'sol', 'js'];
 const CONFIG_PATH = 'etc/prettier-config';
 
+function prettierFlags(phaseName: string) {
+    phaseName = phaseName.replace('/', '-').replace('.', '');
+    return ` --cache --cache-location node_modules/.cache/prettier/.prettier-cache-${phaseName}`;
+}
 export async function prettier(extension: string, check: boolean = false) {
     if (!EXTENSIONS.includes(extension)) {
         throw new Error('Unsupported extension');
@@ -17,19 +21,31 @@ export async function prettier(extension: string, check: boolean = false) {
         return;
     }
 
-    await utils.spawn(`yarn --silent prettier --config ${CONFIG_PATH}/${extension}.js --${command} ${files}`);
+    await utils.spawn(
+        `yarn --silent prettier --config ${CONFIG_PATH}/${extension}.js --${command} ${files} ${prettierFlags(
+            extension
+        )}  ${check ? '' : '> /dev/null'}`
+    );
+}
+
+async function prettierContracts(check: boolean, directory: string) {
+    await utils.spawn(
+        `yarn --silent --cwd ${directory} prettier:${check ? 'check' : 'fix'} ${prettierFlags(directory)} ${
+            check ? '' : '> /dev/null'
+        }`
+    );
 }
 
 async function prettierL1Contracts(check: boolean = false) {
-    await utils.spawn(`yarn --silent --cwd contracts/ethereum prettier:${check ? 'check' : 'fix'}`);
+    await prettierContracts(check, 'contracts/ethereum');
 }
 
 async function prettierL2Contracts(check: boolean = false) {
-    await utils.spawn(`yarn --silent --cwd contracts/zksync prettier:${check ? 'check' : 'fix'}`);
+    await prettierContracts(check, 'contracts/zksync');
 }
 
 async function prettierSystemContracts(check: boolean = false) {
-    await utils.spawn(`yarn --silent --cwd etc/system-contracts prettier:${check ? 'check' : 'fix'}`);
+    await prettierContracts(check, 'etc/system-contracts');
 }
 
 export async function rustfmt(check: boolean = false) {