Add memory ecs

[manmartgarc]

This PR closes #24

Additions:

• Exposes the --memory flag via the CLI to override the memory size of the Docker container instance.
• Extra checks for the memory attribute of the ECSTask class to handle limits imposed by AWS on combinations of vCPU and memory.

[github-actions[bot]]

Coverage Report

File	Stmts	Miss	Cover	Missing
/opt/hostedtoolcache/Python/3.9.16/x64/lib/python3.9/site-packages/cloudtile
__init__.py	0	0	100%
__main__.py	0	88	30%	30, 34, 40, 44, 46, 49, 51, 58–59, 66–69, 71–74, 77–79, 82–87, 89–96, 98–105, 110, 112, 116–117, 123, 130–136, 155, 160–163, 167, 171, 175, 179–180, 184, 188, 192, 200–201, 205, 208–209, 214, 219, 231, 236, 241, 268, 273–274, 278, 282, 293, 296, 303, 316–317, 321
converter.py	0	49	25%	33, 40, 44–46, 54–55, 58–59, 61, 63–66, 77–80, 82, 87, 90–91, 93–95, 97–98, 100–102, 122–124, 126, 128–130, 132–135, 137, 139–141, 143–145, 147
ecs.py	0	0	100%
geofile.py	0	0	100%
s3.py	0	0	100%
TOTAL	513	137	73%

Tests	Skipped	Failures	Errors	Time
77	0 :zzz:	0 :x:	0 :fire:	4.505s :stopwatch: