Identify ways to improve performance of OpenAPI Validator

[vbabuEM]

Currently in a Beckn transaction we check the messages against open-API four times. Each time, it takes a second (if not more) - See the table below for ballpark figures (seconds)
1 vCPU, 2.0 GB - 2.85
2 vCPU, 4.0 GB - 2.2
2 vCPU, 8.0 GB - 1.85
4 vCPU, 16 GB - 1.6 (1.12 - non-docker)

The objective of this issue is to improve the performance of the OpenAPI Validator. Some points to guide the implementation are below.

• Identify and setup instrumentation so that we have a reliable way to identify the amount of time the openapi validator takes (Use this to publish before and after time to illustrate the improvement)
• Some avenues to improve performance are:
  a. Using the latest version of the library
  b. Checking the documentation to see if we are doing validation the right way
  c. Check issues on SO/Github to see if there are any pointers
  d. Anything else....