PEL: Fixes for gcc13

* Add the cstdint header file as now required to get the uint* types.
* Fix a move assignment test
* Refactor some nlohmann::json code to avoid:

```
/usr/include/c++/13/valarra

PEL: Fixes for gcc13

* Add the cstdint header file as now required to get the uint* types.
* Fix a move assignment test
* Refactor some nlohmann::json code to avoid:

```
/usr/include/c++/13/valarray:1201:1: note: template argument deduction/substitution failed:
../extensions/openpower-pels/registry.cpp:665:43: note: ‘const nlohmann::json_abi_v3_11_2::basic_json<>::value_type’ {aka ‘const nlohmann::json_abi_v3_11_2::basic_json<>’} is not derived from ‘const std::valarray<_Tp>’
665 | (name == j["SRC"]["ReasonCode"] && type == LookupType::reasonCode));
```

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: Ia3e733602134a60008d0d47934f95a217d2a0eb1

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PEL: Create TemporaryFile class

Added support for creating temporary file
- Constructor creates the temporary file with data
- Destructor doesn't deletes file due to PEL function

PEL: Create TemporaryFile class

Added support for creating temporary file
- Constructor creates the temporary file with data
- Destructor doesn't deletes file due to PEL function
related requirements.
- Provided remove function to delete the file.

Tested: Added test cases for TemporaryFile class and verified
test_openpower_pels_temporary_file OK 0.03s

Signed-off-by: Jayanth Othayoth <ojayanth@in.ibm.com>
Change-Id: I5295998d746ef1228512545f0a19faa1f94260d8

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