esp32: Add IDF Component Lockfiles to git repo.

This is recommended by Espressif, and it's the only way to ensure
everyone builds the same set of component versions.

The awkward part is that updating the ESP-IDF version will churn a line
in each of these files (and possibly other changes).

Adds a build-time check for lock file changes, which is either a warning or
a hard error depending on the value of MICROPY_MAINTAINER_BUILD
flag (introduced in previous commit).

This work was funded through GitHub Sponsors.

Signed-off-by: Angus Gratton <angus@redyak.com.au>

ports/esp32/lockfiles/dependencies.lock.esp32c6

@@ -0,0 +1,21 @@
+dependencies:
+  espressif/mdns:
+    component_hash: 46ee81d32fbf850462d8af1e83303389602f6a6a9eddd2a55104cb4c063858ed
+    dependencies:
+    - name: idf
+      require: private
+      version: '>=5.0'
+    source:
+      registry_url: https://components.espressif.com/
+      type: service
+    version: 1.1.0
+  idf:
+    source:
+      type: idf
+    version: 5.4.2
+direct_dependencies:
+- espressif/mdns
+- idf
+manifest_hash: 3b18b5bbac91c9fe5098d3759a37c84ed0828546d8cbc92e26e4c1698e689c8a
+target: esp32c6
+version: 2.0.0