[FEATURE] Add ability to filter accounts for repo/$PWD

[KennyS-Cox]

Feature Request 🚀

Ability to have a file in repo/directory that alks can use to filter accounts for alks sessions open --filter-file or something similar.

example file: <repo>/.alks

[AccountNames]
awsgdmowner
awsgdmownernp

Describe Your Feature Request

Similar to #185, I have a bunch of accounts and roles. Would be nice to be able to filter accounts to the repo I am currently using so when I run alks sessions open --filter-file or something similar, it only shows the accounts that repo will use. Should read the file in $PWD if exists and filter accordingly.

Example before:

➜  ~ alks sessions open
ALKS v3.21.1
? Please select an ALKS account/role (Use arrow keys)
  ************/ALKSAdmin - awsdesignatedcr :: Admin 
  ************/ALKSAdmin - awsdesignatedcrnp :: Admin 
  ************/ALKSAdmin - awsdesignateddescription :: Admin 
  ************/ALKSAdmin - awsdesignateddescriptionnp :: Admin 
  ************/ALKSAdmin - awsgdmowner :: Admin 
  ************/ALKSSsmUser - awsgdmowner :: SsmUser 
❯ ************/ALKSAdmin - awsgdmownernp :: Admin 
  ************/ALKSAdmin - awslifecycledecorators :: Admin 
  ************/ALKSAdmin - awslifecycledecoratorsnp :: Admin 
  ************/ALKSAdmin - awsscs :: Admin 
  ************/ALKSAdmin - awsscsnp :: Admin 
  ************/ALKSAdmin - awssiren :: Admin 
  ************/ALKSReadOnly - awssiren :: ReadOnly 
  ************/ALKSAdmin - awssirennp :: Admin 
  ************/ALKSAdmin - awswholesaleinvfound :: Admin 

Example after:

➜  ~ alks sessions open --filter-file
ALKS v3.21.1
? Please select an ALKS account/role (Use arrow keys)
  ************/ALKSAdmin - awsgdmowner :: Admin 
  ************/ALKSSsmUser - awsgdmowner :: SsmUser 
❯ ************/ALKSAdmin - awsgdmownernp :: Admin