[Feature]Option to provide temp directory path for download

[Rchanger]

Changes to read environment variable TERRRASCAN_CUSTOM_TEMP_DIR to specify a temporary directory to download repository, terraform modules, and cft/arm templates.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov]

Codecov Report

Merging #1214 (99e7b1b) into master (a59fc2b) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1214   +/-   ##
=======================================
  Coverage   77.77%   77.78%           
=======================================
  Files         272      272           
  Lines        7675     7678    +3     
=======================================
+ Hits         5969     5972    +3     
  Misses       1353     1353           
  Partials      353      353           

Impacted Files	Coverage Δ
pkg/cli/run.go	88.23% <100.00%> (ø)
pkg/http-server/remote-repo.go	71.83% <100.00%> (ø)
...per/iac-providers/arm/functions/linked-template.go	89.47% <100.00%> (ø)
.../mapper/iac-providers/cft/functions/s3-download.go	71.87% <100.00%> (ø)
pkg/utils/dir.go	85.71% <100.00%> (+3.89%)	⬆️

[patilpankaj212]

LGTM !!