Rework arrangement rendering

[Kixiron]

Depends on #931

• Reworks how root & normal arrangements are rendered into dataflow
• Simplifies the dataflow graph for most/all programs by reducing redundant mapping
• Adds better operator names for operations within arrangement creation
• Removes an extra arrangement for all programs that use diff_distinct() within them
• Adds some operators that help with the goal of providing better operator names within ddlog dataflow graphs

Saves anywhere from 90ms to 165ms on the twitter-micro benchmarks as well as generally simplifying the dataflow graph and removing some unnecessary arrangements which could have a much more significant impact on larger programs

twitter-micro/4 threads/200000 records
time:   [150.20 ms 151.47 ms 152.68 ms]

twitter-micro/3 threads/200000 records
time:   [177.24 ms 179.61 ms 181.90 ms]

twitter-micro/2 threads/200000 records
time:   [201.80 ms 203.82 ms 205.86 ms]

twitter-micro/1 thread/200000 records
time:   [309.14 ms 312.19 ms 315.29 ms]