Enable basic auth file user store support

[ldclakmal]

Need to enable "basic auth file user store" support after Swan Lake alpha which was disabled due to a limitation of configurable feature does not support for mapping types.

This was disable by the PRs.

1. Disable basic auth file user store support module-ballerina-auth#60
2. Disable basic auth file user store support module-ballerina-http#183

Related PRs:

1. Fix BBEs of access control category ballerina-distribution#1182
2. Disable basic auth integration tests ballerina-distribution#1187

[sameerajayasoma]

Is a mapping type the best choice for this use case? If you use a mapping value, the Config.toml would have the following bits. Here auth is the module name and users is the variable name of map type.

# 1) Inline table version
[auth.users]
alice = { password ="password1", scopes="scope1"}
bob = { password ="password2", scopes="scope1"}


# 2) Standard table version
[auth.users.alice]
password="password1"
scopes="scope1"

[auth.users.bob]
password="password2"
scopes="scope1"

How about using a Ballerina table here? I think following is better. WDYT @shafreenAnfar @ldclakmal ?

[[auth.users]]
username = "alice"
password="password1"
scopes="scope1"

[[auth.users]]
username = "bob"
password="password2"
scopes="scope1"

# With inline tables
[auth]
users = [ { username = "Alice", password ="password1", scopes="scope1"}, 
          { username = "Bob", password ="password2", scopes="scope1"} ]

Here is the Ballerina syntax:

type AuthInfo record {
 readonly string username;
 string password;
};

configurable table<AuthInfo> key(username) & readonly users = ?

[ldclakmal]

Yes. I am +1 for the Ballerina table representation of the TOML file.

IMO, it would be better to support the scopes as an optional array field also, which will end-up the Ballerina syntax as:

type AuthInfo record {
  readonly string username;
  string password;
  string[] scopes?;
};

configurable table<AuthInfo> key(username) & readonly users = ?

[ldclakmal]

The fix is reverted by ballerina-platform/module-ballerina-auth#92.