Unify report with report-external; incorporate module tree information

[emdoyle]

Fixes: #385

Examples:

> tach report python/tach/sync.py --raw               
# Module Dependencies
tach.errors
tach.extension
tach.filesystem
# Module Usages
tach.cli
# External Dependencies
tomli
tomli-w

> tach report python/tach/sync.py --dependencies --usages
[ Dependency Report for 'python/tach/sync.py' ]
-------------------------------
[ Dependencies of 'python/tach/sync.py' ]
python/tach/sync.py[L8]: Import 'tach.errors'
python/tach/sync.py[L9]: Import 'tach.filesystem'
python/tach/sync.py[L11]: Import 'tach.extension.sync_project'
python/tach/sync.py[L13]: Import 'tach.filesystem.get_project_config_path'
-------------------------------
[ Usages of 'python/tach/sync.py' ]
python/tach/cli.py[L37]: Import 'tach.sync.sync_project'
-------------------------------

> tach report python/tach/sync.py --external             
[ External Dependencies in 'python/tach/sync.py' ]
--------------------------------------------------
python/tach/sync.py[L5]: Import 'tomli' from package 'tomli'
python/tach/sync.py[L6]: Import 'tomli_w' from package 'tomli-w'

tach report python/tach/sync.py           
[ Dependency Report for 'python/tach/sync.py' ]
-------------------------------
[ Dependencies of 'python/tach/sync.py' ]
python/tach/sync.py[L8]: Import 'tach.errors'
python/tach/sync.py[L9]: Import 'tach.filesystem'
python/tach/sync.py[L11]: Import 'tach.extension.sync_project'
python/tach/sync.py[L13]: Import 'tach.filesystem.get_project_config_path'
-------------------------------
[ Usages of 'python/tach/sync.py' ]
python/tach/cli.py[L37]: Import 'tach.sync.sync_project'
-------------------------------

[ External Dependencies in 'python/tach/sync.py' ]
--------------------------------------------------
python/tach/sync.py[L5]: Import 'tomli' from package 'tomli'
python/tach/sync.py[L6]: Import 'tomli_w' from package 'tomli-w'