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* 👩‍💻 Update kernel syntax, grounding skill, and add groundedness checks example

This commit updates the kernel syntax examples in the dotnet sample
project to comment out some of the examples that are not needed for
testing. It also modifies the grounding skill to use separate parameters
for the input text, the reference context, and the entities to check.
The skprompt files for the grounding skill are updated accordingly.

Additionally, this commit adds a new example file for demonstrating how
to use the GroundingSkill to remove the entities which are not grounded
in the original text. The example uses the KernelBuilder to import the
GroundingSkill and the SummarizeSkill from the sample skills directory,
and then uses the SequentialPlanner to create and invoke a plan that
takes a text input and returns a grounded summary. The example also
shows how to use the TextSkill to print the results

* 🔧 Add entities variable to grounding check

This commit adds a new variable to the context of the reference check
method, which contains the extracted entities from the summary text.
This variable is used by the reference check method to perform
grounding checks on the entities and ensure they are consistent with
the reference context. This improves the accuracy and reliability of
the reference check method and the quality of the summaries.

* 🐛 Fix groundedness checks in kernel syntax examples

The previous code for the groundedness checks in the kernel syntax
examples had some errors and inconsistencies. This commit fixes the
following issues:

- The extractionResult and groundingResult variables were not properly
  cast to strings before being used as arguments or printed to the
  console.
- The entity_excision function was invoked with the wrong argument,
  passing the groundingResult instead of the context.
- The final output message was missing the word "Planning" to indicate
  the task.

* Undo program.cs changes

* 📝 Update groundedness checks example

This commit updates the groundedness checks example in the kernel
syntax examples folder. It adds some comments and example output to
the code, and removes an unnecessary line that printed the ask
variable. It also improves the formatting of the ask variable by
removing the extra quotes and using a single line string. The commit
aims to make the example more clear and readable for the users.

* 📝 Remove context from skprompt.txt

The context section in skprompt.txt was redundant and irrelevant for the
task of parsing references to items. This commit removes the context
section and updates the task description accordingly. This simplifies the
task and makes it more focused on the reference check entities skill.

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Co-authored-by: Richard Edgar (Microsoft) <riedgar@microsoft.com>
Co-authored-by: Lee Miller <lemillermicrosoft@users.noreply.github.com>

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