Add LLDB pretty printers for more types

[jabraham17]

Adds new pretty printers for chapel types

Notably, adds pretty printers for some chpl__hashtable based data structures like Set and Map and for distributed arrays like blockDist and cyclicDist.

In this PR

• Pretty printer for chpl__hashtable and chpl_TableEntry
• Pretty printer for Set, based on chpl__hashtable pretty printer
• Pretty printer for Map, based on chpl__hashtable pretty printer
• Add a general pretty printer for arrays based on dsiAccess
• Add a command to emulate gdb's ptype

• paratest

[Reviewed by @dlongnecke-cray]