unit tests for parseRequestURL function

[SVilgelm]

• unit tests for the PathParams, RawPathParams and QueryParams added by client and request
• unit tests for client.HostURL and client.BaseURL
• use client.BaseURL by default and fallback to client.HostURL if empty

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.13% :tada:

Comparison is base (1ae2aac) 95.65% compared to head (546a0e3) 95.78%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #709 +/- ## ========================================== + Coverage 95.65% 95.78% +0.13% ========================================== Files 12 12 Lines 1612 1615 +3 ========================================== + Hits 1542 1547 +5 + Misses 42 41 -1 + Partials 28 27 -1 ``` | [Files Changed](https://app.codecov.io/gh/go-resty/resty/pull/709?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=go-resty) | Coverage Δ | | |---|---|---| | [middleware.go](https://app.codecov.io/gh/go-resty/resty/pull/709?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=go-resty#diff-bWlkZGxld2FyZS5nbw==) | `92.97% <100.00%> (+0.74%)` | :arrow_up: |

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[SVilgelm]

@jeevatkm as promised

[SVilgelm]

yw