Adds static tape functions to control tape activation

[auto-differentiation-dev]

Description

This adds static functions to Tape to activate a given tape or to deactivate the currently-active one. These functions are useful in some cases, for example for external script interfaces.

Type of change

• New feature (non-breaking change which adds functionality)

[github-actions]

Test Results

    29 files  ± 0      29 suites  ±0   10m 54s ⏱️ ±0s
 1 275 tests + 2   1 275 ✅ + 2  0 💤 ±0  0 ❌ ±0 
36 937 runs  +58  36 937 ✅ +58  0 💤 ±0  0 ❌ ±0 

Results for commit 5f6a608. ± Comparison against base commit 41af595.

[coveralls]

coverage: 98.792% (+0.002%) from 98.79%
when pulling 5f6a608 on feature/global-tape-activation
into 41af595 on main.