Refactor bmqu::AlignedPrinter to accept vector of strings

[678098]

Is your feature request related to a problem?

bmqu::AlignedPrinter class has some problems:

• The class' API expects bsl::vector<const char*> argument which is strange. The conventional way is to pass bsl::vector<bsl::string>.
• It also stores this vector as a field.
• To get the const char* length, bsl::strlen is used.

blazingmq/src/groups/bmq/bmqu/bmqu_alignedprinter.h

Line 92 in e19ff33

const bsl::vector<const char*>* fields,

Describe the solution you'd like

Refactor bmqu::AlignedPrinter, so:

• bmqu::AlignedPrinter constructor expects bsl::string, not const char*
• bmqu::AlignedPrinter also stores these strings as a const bsl::vector<bsl::string> field (might be a pointer, might be a reference)
• Add precondition assert that d_fields_p is not NULL in constructor AlignedPrinter::AlignedPrinter or initialize this field as a reference
• Update usage examples in the unit's documentation
• Update the code that uses this class

Alternatives you considered

No response