[Go] Parse integer array query parameters. Fix typos

Created by: aliakseiz

*Affects the Go-server only.

Limited support of integer array parameters in a query

Adds a code generation to parse query parameter fields of int32 array and int64 array types. Assumes that style: form and explode: false are used as serialization method.

openapi: "3.0.0"
info:
  description: Example API
  version: 1.0.0
  title: "Example API"

servers:
  - url: http://localhost:8080/api/v1
    description: development server

paths:
  /companies:
    get:
      summary: Filter companies by specified criteria
      operationId: find
      parameters:
        - name: ids
          in: query
          example: "500, 501"
          schema:
            type: array
            items:
              type: integer
              format: int64
      tags:
        - Company
      responses:
        200:
          description: Successful operation

Before:

parentIDsParam := strings.Split(query.Get("ids"), ",")

After:

mtinfoIDsParam, err := parseInt64ArrayParameter(query.Get("ids"), ",", false)
if err != nil {
	c.errorHandler(w, r, &ParsingError{Err: err}, nil)
	return
}

Other

Fixes minor typos in comments.

Technical committee

@antihax @grokify @kemokemo @jirikuncar @ph4r5h4d

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