feat(FN-3163): MDM endpoints for automatically creating new DTFS customers in Salesforce GET only

[natdeanlewissoftwire]

Introduction :pencil2:

Contains just the new Salesforce GET endpoint from https://github.com/UK-Export-Finance/mdm-api/pull/1057

Resolution :heavy_check_mark:

Add a salesforce get endpoint to get a customer from Salesforce by Companies House Number

Miscellaneous :heavy_plus_sign:

Couple of typo fixes, adding of tests where missing, docs update

[sonarcloud[bot]]

Quality Gate failed

Failed conditions
2 Security Hotspots

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