Enhance YAML Parser (RDT-630)

[hfudev]

The vanilla yaml does not support reuse arrays, the merge only happens with different keys.

Support + and - as postfixes to reuse arrays.

.base_depends_components: &base-depends-components
  depends_components:
    - esp_hw_support
    - esp_rom
    - esp_wifi
  
examples/wifi/coexist:
  <<: *base-depends-components
  depends_components+:
    - esp_coex
  depends_components-:
    - esp_rom

Will be interpreted into

examples/wifi/coexist:
  depends_components:
    - esp_hw_support
    - esp_wifi
    - esp_coex

The + and - here could be used on all keywords that could be used as a dict key, like depends_components, depends_filepatterns, disable, enable, ...

The way that how items defined in the + and - matching with the original ones must be flexible. For example, in each if-clause defined under the enable key, we support three keywords: if, temp, reason. if should be the match key here.

For example,

.base: &base
  enable:
    - if: IDF_VERSION == "5.2.0"
    - if: IDF_VERSION == "5.3.0"

foo:
  <<: *base
  enable+:
    - if: IDF_VERSION == "5.2.0"
      temp: true  # <-- This line should not be added, since the `if` is the matching key, and the `if` statement is the same.
    - if: IDF_VERSION == "5.4.0"
      reason: bar

Will be interpreted into

foo:
  enable:
    - if: IDF_VERSION == "5.2.0"
    - if: IDF_VERSION == "5.3.0"
    - if: IDF_VERSION == "5.4.0"
      reason: bar

Create a subpackage idf_build_apps.yaml for this new yaml parser. This could be reused elsewhere.