Issue 1841 pub flow - createAsset Fn

[paulo-ocean]

Fixes #1841 .

Changes proposed in this PR:

• generic function (exported) to create an asset
• update config, set confidential evm key
• calculate template index (from id or address)
• if confidential evm have filesObject on constructor (no need to provider encrypt)

[paulo-ocean]

btw, the service "files" cannot be null for confidential EVM, but empty string instead...
if its null the DDO does not passes against schema validation
schema:ServiceShape

....
sh:targetClass schema:Service ;
    sh:property [
        sh:path schema:id ;
        sh:datatype xsd:string ;
        sh:pattern "^(.*)$" ;
        sh:minCount 1;
        sh:maxCount 1;
    ] ;
...

[alexcos20]

btw, the service "files" cannot be null for confidential EVM, but empty string instead... if its null the DDO does not passes against schema validation schema:ServiceShape

....
sh:targetClass schema:Service ;
    sh:property [
        sh:path schema:id ;
        sh:datatype xsd:string ;
        sh:pattern "^(.*)$" ;
        sh:minCount 1;
        sh:maxCount 1;
    ] ;
...

then let's go with empty string

[codeclimate]

Code Climate has analyzed commit 6ea2ea2 and detected 11 issues on this pull request.

Here's the issue category breakdown:

Category	Count
Complexity	9
Duplication	2

The test coverage on the diff in this pull request is 58.5% (50% is the threshold).

This pull request will bring the total coverage in the repository to 74.4% (-1.2% change).

View more on Code Climate.