Bash: Respect completion-ignore-case readline setting

[adaszko]

In JIT mode, the current bash completion matching logic simply does completion.starts_with(...) which is wrong when completion-ignore-case is set.

Similarly in AOT mode:

• complgen/src/aot/bash.rs

  Line 127 in 5e29dcb

  if [[ $literal = "${{completed_prefix}}"* ]]; then

• complgen/src/aot/bash.rs

  Line 354 in 5e29dcb

  if [[ $literal = "${{prefix}}"* ]]; then

• complgen/src/aot/bash.rs

  Line 387 in 5e29dcb

  if [[ $item = "${{prefix}}"* ]]; then

• complgen/src/aot/bash.rs

  Line 408 in 5e29dcb

  if [[ $item = "${{prefix}}"* ]]; then

Fix: Retrieve the settings value with something like bind -V | grep completion-ignore-case and behave conditionally based on its value.

• TODO:
  • Write e2e tests for JIT mode
  • Wrte e2e tests for AOT mode
  • Fix JIT mode
  • Fix AOT mode