feat: each provider can have its own timeout

providers.azure.timeout, providers.databricks.timeout and
providers.repos.timeout override providers.timeout for that provider's
requests; --timeout still sets them all. lazysecrets share, which reads
a key and repo files, waits the longest of them.

docs/config.md

@@ -27,17 +27,20 @@ updates:
     - https://github.com/karleinarb/lazysecrets
     - https://git.kebcloud.no/keb/lazysecrets
 providers:
-  timeout: 30s                           # per backend request
+  timeout: 30s                           # per backend request; a provider's own timeout overrides it
   azure:                                 # applies to every az account
     enabled: true                        # default
+    timeout: 30s
     hideSubscriptions: [platform-mgmt]   # by name or ID
     vaults:                              # listed under "Pinned vaults", for vaults
       - https://kv-foo.vault.azure.net/  # you can read but not discover
   databricks:
     enabled: true
+    timeout: 30s
     hideProfiles: [test]
   repos:
     enabled: true
+    timeout: 30s
     roots: [~/git]
     paths: [~/work/infra]
     include: ["secrets/**"]