Add Platform Org Service related service methods

APIs covered:

• SearchOrganization
• LookupOrganization

Add BulkDelete method

• Add BulkDelete method to delete the elasticsearch documents using _bulk API

Bug fix: Query param

Merge pull request #23 from LF-Engineering/query-param-fix

Fix query param bug

Identity by username

• Add get identity by username

Fix es dependency

Merge pull request #19 from LF-Engineering/update-es-lib

Update official es lib to the latest version

Add get identity by user client function

Merge pull request #18 from LF-Engineering/add-common-util

Add common util

Fix auth0 token generation bugs

• fix auth0 token generation bugs

Add methods to affiliation

Following new methods are added:

• GetIdentity
• GetProfile
• GetOrganizations

Enhance elastic bulk errors

Enhance elastic bulk errors

Add affiliations api client & auth0 token generator

Merge pull request #14 from LF-Engineering/affiliations

url escape affs api path params