Migrate Send Logic to 64-bit Time

[nibanks]

Description

Updates the send logic to use 64-bit time instead of 32-bit. Makes calculating one-way delay time easier. Also required for larger RTT (i.e. space) scenarios.

Testing

Existing automation

Documentation

N/A

[codecov]

Codecov Report

Merging #3848 (c3244cf) into main (e6d5044) will decrease coverage by 0.34%.
The diff coverage is 89.65%.

@@            Coverage Diff             @@
##             main    #3848      +/-   ##
==========================================
- Coverage   86.74%   86.41%   -0.34%     
==========================================
  Files          56       56              
  Lines       16596    16597       +1     
==========================================
- Hits        14397    14343      -54     
- Misses       2199     2254      +55     

Files Changed	Coverage Δ
src/core/congestion_control.h	79.59% <ø> (ø)
src/core/connection.h	98.89% <ø> (+1.65%)	⬆️
src/core/path.h	100.00% <ø> (ø)
src/core/sent_packet_metadata.h	100.00% <ø> (ø)
src/core/stream.h	93.33% <ø> (ø)
src/core/cubic.c	77.35% <50.00%> (+1.25%)	⬆️
src/core/bbr.c	68.10% <80.00%> (-4.32%)	⬇️
src/core/loss_detection.c	89.43% <92.59%> (-0.60%)	⬇️
src/core/connection.c	81.45% <100.00%> (-0.20%)	⬇️
src/core/packet_builder.c	91.82% <100.00%> (ø)
... and 3 more

... and 9 files with indirect coverage changes