Add max_item_size() to etl::ipool (#1001) #545

Job	Run time
Syntax Check - Clang C++03 Linux No STL (ubuntu-22.04)	27s
Syntax Check - Clang C++03 Linux STL (ubuntu-22.04)	23s
Syntax Check - Clang C++11 Linux No STL (ubuntu-22.04)	36s
Syntax Check - Clang C++11 Linux No STL Force C++03 (ubuntu-22.04)	34s
Syntax Check - Clang C++11 Linux STL (ubuntu-22.04)	39s
Syntax Check - Clang C++11 Linux STL Force C++03 (ubuntu-22.04)	48s
Syntax Check - Clang C++14 Linux No STL (ubuntu-22.04)	36s
Syntax Check - Clang C++14 Linux No STL Force C++03 (ubuntu-22.04)	35s
Syntax Check - Clang C++14 Linux STL (ubuntu-22.04)	44s
Syntax Check - Clang C++14 Linux STL Force C++03 (ubuntu-22.04)	50s
Syntax Check - Clang C++17 Linux No STL (ubuntu-22.04)	53s
Syntax Check - Clang C++17 Linux STL (ubuntu-22.04)	50s
Syntax Check - Clang C++17 Linux STL Force C++03 (ubuntu-22.04)	56s
Syntax Check - Clang C++17 Linux No STL Force C++03 (ubuntu-22.04)	43s
Syntax Check - Clang C++20 Linux No STL (ubuntu-22.04)	1m 2s
Syntax Check - Clang C++20 Linux No STL Force C++03 (ubuntu-22.04)	1m 0s
Syntax Check - Clang C++20 Linux STL (ubuntu-22.04)	1m 16s
Syntax Check - Clang C++20 Linux STL Force C++03 (ubuntu-22.04)	1m 18s
	14m 10s

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