Improve performance of building unencoded URLs

[bdraco]

What do these changes do?

Improve performance of building unencoded URLs

• Move the host encoding out of _make_netloc so it can be cached (always requires an encoded host now -- internal change only)
• Guard all _normalize_path with a "." check

Are there changes in behavior for the user?

no

baseline

Make URL with host and path and port: 0.111 sec
Make encoded URL with host and path and port: 0.024 sec
Make URL with host and path: 0.106 sec
Make URL with many hosts: 0.420 sec
Make URL with IPv4 Address and path and port: 0.113 sec
Make URL with IPv4 Address and path: 0.107 sec
Make URL with IPv6 Address and path and port: 0.128 sec
Make URL with IPv6 Address and path: 0.118 sec

this change

Make URL with host and path and port: 0.088 sec
Make encoded URL with host and path and port: 0.023 sec
Make URL with host and path: 0.086 sec
Make URL with many hosts: 0.410 sec
Make URL with IPv4 Address and path and port: 0.089 sec
Make URL with IPv4 Address and path: 0.093 sec
Make URL with IPv6 Address and path and port: 0.104 sec
Make URL with IPv6 Address and path: 0.105 sec

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.59%. Comparing base (cf0ab10) to head (1ec78d9).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1188      +/-   ##
==========================================
- Coverage   95.60%   95.59%   -0.01%     
==========================================
  Files          25       25              
  Lines        4887     4879       -8     
  Branches      260      262       +2     
==========================================
- Hits         4672     4664       -8     
  Misses        189      189              
  Partials       26       26              

Flag	Coverage Δ
CI-GHA	95.57% <100.00%> (-0.01%)	⬇️
MyPy	42.43% <100.00%> (-0.12%)	⬇️
OS-Linux	99.38% <100.00%> (-0.03%)	⬇️
OS-Windows	99.45% <100.00%> (-0.03%)	⬇️
OS-macOS	99.07% <100.00%> (-0.03%)	⬇️
Py-3.10.11	98.97% <100.00%> (-0.03%)	⬇️
Py-3.10.15	99.25% <100.00%> (-0.03%)	⬇️
Py-3.11.10	99.25% <100.00%> (-0.03%)	⬇️
Py-3.11.9	98.97% <100.00%> (-0.03%)	⬇️
Py-3.12.7	99.25% <100.00%> (-0.03%)	⬇️
Py-3.13.0	99.25% <100.00%> (-0.03%)	⬇️
Py-3.8.10	98.92% <100.00%> (-0.03%)	⬇️
Py-3.8.18	99.20% <100.00%> (-0.03%)	⬇️
Py-3.9.13	98.92% <100.00%> (-0.03%)	⬇️
Py-3.9.20	99.20% <100.00%> (-0.03%)	⬇️
Py-pypy7.3.11	99.26% <100.00%> (-0.03%)	⬇️
Py-pypy7.3.16	99.26% <100.00%> (-0.03%)	⬇️
Py-pypy7.3.17	99.29% <100.00%> (-0.03%)	⬇️
VM-macos-latest	99.07% <100.00%> (-0.03%)	⬇️
VM-ubuntu-latest	99.38% <100.00%> (-0.03%)	⬇️
VM-windows-latest	99.45% <100.00%> (-0.03%)	⬇️
pytest	99.38% <100.00%> (-0.03%)	⬇️

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